Choi Hyun-mi, a North Korean boxer who defected to South Korea in 2003, takes part in a training session in Seoul, January 3, 2018. Picture taken January 3, 2018. REUTERS/Kim Hong-ji

Choi Hyun-mi, a North Korean boxer who defected to South Korea in 2003, takes part in a training session in Seoul, January 3, 2018. Picture taken January 3, 2018. REUTERS/Kim Hong-ji

Choi Hyun-mi, a North Korean boxer who defected to South Korea in 2003, takes part in a training session in Seoul, January 3, 2018. Picture taken on January 3, 2018. REUTERS/Kim Hong-ji

Choi Hyun-mi, a North Korean boxer who defected to South Korea in 2003, takes part in a training session in Seoul, January 3, 2018. Picture taken on January 3, 2018. REUTERS/Kim Hong-ji

Choi Hyun-mi, a North Korean boxer who defected to South Korea in 2003, poses for photographs in Seoul, January 3, 2018. Picture taken January 3, 2018. REUTERS/Kim Hong-ji

Choi Hyun-mi, a North Korean boxer who defected to South Korea in 2003, takes part in a training session in Seoul, January 3, 2018. Picture taken January 3, 2018. REUTERS/Kim Hong-ji

Kim Mi-hyun of South Korea speaks during a news conference at the final round of the LPGA Championship golf tournament at Sky72 Golf Club in Incheon, west of Seoul, October 21, 2012. Eight-time LPGA Tour winner Kim bade farewell to competitive golf on Sunday, after completing her final round at the LPGA Championship in Incheon, Yonhap reported. REUTERS/Lee Jae-Won (SOUTH KOREA - Tags: SPORT GOLF HEADSHOT)

Mi Hyun Kim of South Korea hits out of a bunker onto the fourth green during the third round of the CME Group Titleholders LPGA golf tournment in Orlando, Florida, November 19, 2011. REUTERS/Phelan M. Ebenhack (UNITED STATES - Tags: SPORT GOLF)

Mi Hyun Kim of South Korea watches her tee shot on the ninth hole during the first round of the CME Group Titleholders LPGA golf tournament in Orlando, Florida, November 17, 2011. REUTERS/Phelan M. Ebenhack (UNITED STATES - Tags: SPORT GOLF)

Kim Mi-hyun of South Korea reacts to a missed putt on the second hole during the third round at the Canadian Women's Open golf tournament in Mirabel, Quebec August 27, 2011. REUTERS/Christinne Muschi (CANADA - Tags: SPORT GOLF)

South Korea's Park Mi-Hyun embraces Kim Bo-Mi (back to camera) after Kim scored a goal against Spain during their Women's field hockey World Cup tournament match in Rosario September 4, 2010. REUTERS/Andres Stapff (ARGENTINA - Tags: SPORT FIELD HOCKEY)

South Korea's WBA featherweight title champion Choi Hyun-Mi exercises during a photo call in Sungkyunkwan University in Seoul November 26, 2009. Choi is known as the "Defector Boxer Girl" in South Korea, where she is a new hope for a declining sport in the country that was known for producing scrappy and fearless fighters who steadily climbed the world rankings. Choi traded an accordion for boxing gloves, Kim Jong-il's cult leadership for capitalism, and the red bandanas worn by North Korean school children for the World Boxing Association championship belt. Picture taken November 26, 2009. REUTERS/Lee Jae-Won (SOUTH KOREA SPORT BOXING SOCIETY)

Choi Hyun-Mi (L) of South Korea fights challenger Tsubasa Tenku of Japan during their WBA featherweight title match at a gym in Sungkyunkwan University in Suwon, south of Seoul November 21, 2009. Choi is known as the "Defector Boxer Girl" in South Korea, where she is a new hope for a declining sport in the country that was known for producing scrappy and fearless fighters who steadily climbed the world rankings. Choi traded an accordion for boxing gloves, Kim Jong-il's cult leadership for capitalism, and the red bandanas worn by North Korean school children for the World Boxing Association championship belt. Picture taken November 21, 2009. REUTERS/Lee Jae-Won (SOUTH KOREA SPORT BOXING SOCIETY)

Choi Hyun-Mi (R) of South Korea fights challenger Tsubasa Tenku of Japan during their WBA featherweight title match at a gym in Sungkyunkwan University in Suwon, south of Seoul November 21, 2009. Choi is known as the "Defector Boxer Girl" in South Korea, where she is a new hope for a declining sport in the country that was known for producing scrappy and fearless fighters who steadily climbed the world rankings. Choi traded an accordion for boxing gloves, Kim Jong-il's cult leadership for capitalism, and the red bandanas worn by North Korean school children for the World Boxing Association championship belt. Picture taken November 21, 2009. REUTERS/Lee Jae-Won (SOUTH KOREA SPORT BOXING)

Choi Hyun-Mi of South Korea poses after defending her crown at the WBA featherweight title match against challenger Tsubasa Tenku (not pictured) of Japan at a gym in Sungkyunkwan University in Suwon, south of Seoul November 21, 2009. Choi is known as the "Defector Boxer Girl" in South Korea, where she is a new hope for a declining sport in the country that was known for producing scrappy and fearless fighters who steadily climbed the world rankings. Choi traded an accordion for boxing gloves, Kim Jong-il's cult leadership for capitalism, and the red bandanas worn by North Korean school children for the World Boxing Association championship belt. Picture taken November 21, 2009. REUTERS/Lee Jae-Won (SOUTH KOREA SPORT BOXING SOCIETY)

South Korea's WBA featherweight title champion Choi Hyun-Mi poses during an interview with Reuters in Sungkyunkwan University in Seoul November 26, 2009. Choi is known as the "Defector Boxer Girl" in South Korea, where she is a new hope for a declining sport in the country that was known for producing scrappy and fearless fighters who steadily climbed the world rankings. Choi traded an accordion for boxing gloves, Kim Jong-il's cult leadership for capitalism, and the red bandanas worn by North Korean school children for the World Boxing Association championship belt. Picture taken November 26, 2009. REUTERS/Lee Jae-Won (SOUTH KOREA SPORT BOXING)

South Korea's WBA featherweight title champion Choi Hyun-Mi excercises during a photo call in Sungkyunkwan University in Seoul November 26, 2009. Choi is known as the "Defector Boxer Girl" in South Korea, where she is a new hope for a declining sport in the country that was known for producing scrappy and fearless fighters who steadily climbed the world rankings. Choi traded an accordion for boxing gloves, Kim Jong-il's cult leadership for capitalism, and the red bandanas worn by North Korean school children for the World Boxing Association championship belt. Picture taken November 26, 2009. REUTERS/Lee Jae-Won (SOUTH KOREA SPORT BOXING SOCIETY)

South Korea's WBA featherweight title champion Choi Hyun-Mi speaks during an interview with Reuters in Sungkyunkwan University in Seoul November 26, 2009. Choi is known as the "Defector Boxer Girl" in South Korea, where she is a new hope for a declining sport in the country that was known for producing scrappy and fearless fighters who steadily climbed the world rankings. Choi traded an accordion for boxing gloves, Kim Jong-il's cult leadership for capitalism, and the red bandanas worn by North Korean school children for the World Boxing Association championship belt. Picture taken November 26, 2009. REUTERS/Lee Jae-Won (SOUTH KOREA SPORT BOXING SOCIETY)

South Korea's WBA featherweight title champion Choi Hyun-Mi smiles during an interview with Reuters in Sungkyunkwan University in Seoul November 26, 2009. Choi is known as the "Defector Boxer Girl" in South Korea, where she is a new hope for a declining sport in the country that was known for producing scrappy and fearless fighters who steadily climbed the world rankings. Choi traded an accordion for boxing gloves, Kim Jong-il's cult leadership for capitalism, and the red bandanas worn by North Korean school children for the World Boxing Association championship belt. Picture taken November 26, 2009. REUTERS/Lee Jae-Won (SOUTH KOREA SPORT BOXING SOCIETY)

South Korea's Shin Ji-yai (R) hugs her compatriot Kim Mi-hyun as she celebrates winning after the final round of the HSBC Women's Champions golf tournament in Singapore March 8, 2009. REUTERS/Vivek Prakash (SINGAPORE)

South Korea's Kim Mi-Hyun looks out at her approach shot on the fifth fairway during the fourth and final round of the HSBC Women's Champions golf tournament in Singapore March 8, 2009. REUTERS/Vivek Prakash (SINGAPORE)

South Korea's Kim Mi-hyun examines the 15th green during the third round of the HSBC Women's Champions golf tournament in Singapore March 7, 2009. REUTERS/Vivek Prakash (SINGAPORE SPORT GOLF IMAGE OF THE DAY TOP PICTURE)

South Korea's Kim Mi-hyun hits an approach shot on the 15th fairway during the third round of the HSBC Women's Champions golf tournament in Singapore March 7, 2009. REUTERS/Vivek Prakash (SINGAPORE SPORT GOLF)

South Korea's Kim Mi-hyun tees off on the eighth hole during the second round of the HSBC Women's Champions golf tournament in Singapore March 6, 2009. REUTERS/Vivek Prakash (SINGAPORE)

Kim Mi-hyun of South Korea smiles after her putt on the 1st green during the final round of the LPGA Hana Bank-Kolon Championship golf tournament at Sky72 Golf Club Ocean course in Incheon, west of Seoul, November 2, 2008. REUTERS/Jo Yong-Hak (SOUTH KOREA)

Kim Mi-hyun of South Korea tees off at the 1st hole during the final round of the LPGA Hana Bank-Kolon Championship golf tournament at Sky72 Golf Club Ocean course in Incheon, west of Seoul, November 2, 2008. REUTERS/Jo Yong-Hak (SOUTH KOREA)

Kim Mi-hyun of South Korea looks at her tee shot on the eighth hole during the second round of the LPGA Hana Bank-Kolon Championship golf tournament at Sky72 Golf Club Ocean course in Incheon, west of Seoul, November 1, 2008. REUTERS/Jo Yong-Hak (SOUTH KOREA)

Park Mi-Young (L) and Kim Kyung-Ah (C) of South Korea celebrate with their coach Hyun Jung-Hwa after winning their women's team bronze medal table tennis doubles match against Japan at the Beijing 2008 OIympic Games August 17, 2008. REUTERS/Joe Chan (CHINA)

Mi Hyun Kim of South Korea watches her drive on the 11th hole during the second round of the Ginn Tribute Hosted by Annika women's LPGA golf tournament in Mount Pleasant, South Carolina May 30, 2008. REUTERS/Chris Keane (UNITED STATES)

Kim Mi-hyun of South Korea lines up a putt on the second green during the third round of the LPGA Kraft Nabisco Championship in Rancho Mirage, California April 5, 2008. REUTERS/Lucy Nicholson (UNITED STATES)

Kim Mi Hyun of South Korea tees off on the 15th hole during the second round of the LPGA Kraft Nabisco Golf Championship in Rancho Mirage, California, April 4, 2008. REUTERS/Lucy Nicholson (UNITED STATES)

Kim Mi Hyun of South Korea waves after completing a putt on the 15th green during the second round of the LPGA Kraft Nabisco Golf Championship in Rancho Mirage, California, April 4, 2008. REUTERS/Lucy Nicholson (UNITED STATES)

Mi Hyun Kim of South Korea watches her tee shot on the sixth hole during the final round of the ADT Championship LPGA golf tournament at the Trump International course in West Palm Beach, Florida November 18, 2007. REUTERS/Hans Deryk (UNITED STATES)

Mi Hyun Kim of Korea blasts out of a sand trap on the 18th hole during the third round of the ADT Championship LPGA golf tournament at the Trump International course in West Palm Beach, Florida November 17, 2007. REUTERS/Hans Deryk (UNITED STATES)

Mi Hyun Kim of South Korea reacts after missing a birdie putt on the fourth hole during the third round of the ADT Championship LPGA golf tournament at the Trump International course in West Palm Beach, Florida November 17, 2007. REUTERS/Hans Deryk (UNITED STATES)

Mi Hyun Kim of South Korea bows to applause from the gallery as she walks to the 18th green during the second round of the ADT Championship LPGA golf tournament at the Trump International course in West Palm Beach, Florida November 16, 2007. REUTERS/Hans Deryk (UNITED STATES)

Mi Hyun Kim of South Korea watches her tee shot on the ninth hole during the second round of the ADT Championship LPGA golf tournament at the Trump International course in West Palm Beach, Florida November 16, 2007. REUTERS/Hans Deryk (UNITED STATES)

Mi Hyun Kim of South Korea watches her tee shot on the ninth hole during first round of the ADT Championship LPGA golf tournament at the Trump International course in West Palm Beach, Florida November 15, 2007. REUTERS/Hans Deryk (UNITED STATES)

Kim Mi Hyun (L) of South Korea and compatriot Jeong Jang (R) walk the 14th fairway together during the LPGA Samsung World Championship golf tournament at Bighorn golf club in Palm Desert, California October 14, 2007. REUTERS/Danny Moloshok (UNITED STATES)

Kim Mi Hyun of South Korea watches her drive from the fourth tee box on her way to finishing second in the LPGA Samsung World Championship golf tournament at Bighorn golf club in Palm Desert, California October 14, 2007. REUTERS/Danny Moloshok (UNITED STATES)

Kim Mi Hyun of South Korea hits her second shot on the third hole on her way to finishing in second place during the LPGA Samsung World Championship golf tournament at Bighorn golf club in Palm Desert, California October 14, 2007. REUTERS/Danny Moloshok (UNITED STATES)

Kim Mi Hyun of South Korea tees off on the fourth hole during the LPGA Samsung World Championship golf tournament at Bighorn golf club in Palm Desert, California October 14, 2007. REUTERS/Danny Moloshok (UNITED STATES)

Kim Mi Hyun of South Korea hits her approach shot onto the 17th green during the LPGA Samsung World Championship golf tournament at Bighorn golf club in Palm Desert, California October 13, 2007. REUTERS/Danny Moloshok (UNITED STATES)

Kim Mi Hyun of South Korea celebrates sinking a birdie putt on the 17th green during the LPGA Samsung World Championship golf tournament at Bighorn golf club in Palm Desert, California October 13, 2007. REUTERS/Danny Moloshok (UNITED STATES)

Kim Mi Hyun of South Korea lines up her putt on the 17th green during the LPGA Samsung World Championship golf tournament at Bighorn golf club in Palm Desert, California October 13, 2007. REUTERS/Danny Moloshok (UNITED STATES)

Kim Mi Hyun of South Korea hits out of a bunker onto the 18th green during the LPGA Samsung World Championship golf tournament at Bighorn golf club in Palm Desert, California October 12, 2007. REUTERS/Danny Moloshok (UNITED STATES)

Kim Mi Hyun of South Korea reacts to her drive from the fourth tee during the LPGA Samsung World Championship golf tournament at Bighorn golf club in Palm Desert, California, October 12, 2007. REUTERS/Danny Moloshok (UNITED STATES)

Kim Mi Hyun of South Korea tees off on the third hole during the LPGA Samsung World Championship golf tournament at Bighorn golf club in Palm Desert, California, October 12, 2007. REUTERS/Danny Moloshok (UNITED STATES)

Kim Mi Hyun of South Korea hits her approach shot from the first fairway during the LPGA Samsung World Championship golf tournament at Bighorn golf club in Palm Desert, California October 11, 2007. REUTERS/Danny Moloshok (UNITED STATES)

Kim Mi-hyun of South Korea chips onto the first green during the LPGA Samsung World Championship golf tournament at Bighorn golf club in Palm Desert, California October 11, 2007. REUTERS/Danny Moloshok (UNITED STATES)

Mi Hyun Kim of South Korea lines up her shot on the seventh hole during the semi final round of the HSBC Women's World Match Play at Wykagyl Country Club in New York July 22, 2007. REUTERS/Keith Bedford (UNITED STATES)

Mi Hyun Kim of South Korea tees off on the third hole during the semi final round of the HSBC Women's World Match Play at Wykagyl Country Club in New York July 22, 2007. REUTERS/Keith Bedford (UNITED STATES)

Jee Young Lee of South Korea (L) hugs compatriot Mi Hyun Kim after losing to her on the 18th hole during the HSBC Women's World Match Play at Wykagyl Country Club in New York July 21, 2007. REUTERS/Keith Bedford (UNITED STATES)

Mi Hyun Kim of South Korea tees off from the 17th hole during the quarter final round of HSBC Women's World Match Play at Wykagyl Country Club in New York July 21, 2007. REUTERS/Keith Bedford (UNITED STATES)

Mi Hyun Kim of South Korea watches her putt fall into the 16th hole during the HSBC Women's World Match Play at Wykagyl Country Club in New York July 21, 2007. REUTERS/Keith Bedford (UNITED STATES)

Mi Hyun Kim of South Korea hits from the fairway of the sixteenth hole during the HSBC Women's World Match Play at Wykagyl Country Club in New York, July 21, 2007. REUTERS/Keith Bedford (UNITED STATES)

Mi Hyun Kim of South Korea watches her tee shot on the second hole during second round of the U.S. Women's Open at Pine Needles Golf Club in Southern Pines June 29, 2007. REUTERS/Hans Deryk (UNITED STATES)

Mi Hyun Kim of South Korea reacts to her missed birdie putt on the 15th green during the third round at the Ginn Open LPGA golf tournament in Reunion, Florida April 14, 2007. REUTERS/Charles W Luzier (UNITED STATES)

Kim Mi-hyun of South Korea reacts to her missed birdie putt on the fifth green during the third round of the Ginn Open LPGA golf tournament in Reunion, Florida April 14, 2007. REUTERS/Charles W Luzier (UNITED STATES)

Kim Mi-hyun of South Korea watches her tee shot from the third hole during the third round of the Ginn Open LPGA golf tournament in Reunion, Florida April 14, 2007. REUTERS/Charles W Luzier (UNITED STATES)