Women wearing face masks walk past a banner promoting a social distancing campaign displayed on the wall of Seoul City Hall in Seoul, South Korea, November 27, 2020. REUTERS/Heo Ran

A woman wearing a face mask sits in a bus amid the coronavirus disease (COVID-19) pandemic in Seoul, South Korea, November 27, 2020. REUTERS/Heo Ran

People wearing face masks walk?at a traditional market amid the coronavirus disease (COVID-19) pandemic in Seoul, South Korea, November 27, 2020. REUTERS/Heo Ran

People wearing face masks walk at a traditional market amid the coronavirus disease (COVID-19) pandemic in Seoul, South Korea, November 27, 2020. REUTERS/Heo Ran

A woman wearing a face mask walks at a traditional market amid the coronavirus disease (COVID-19) pandemic in Seoul, South Korea, November 27, 2020. REUTERS/Heo Ran

Christmas trees are seen on display at a traditional market amid the coronavirus disease (COVID-19) pandemic in Seoul, South Korea, November 26, 2020. REUTERS/Kim Hong-Ji

A woman takes photographs of Christmas illuminations in front of a department store amid the coronavirus disease (COVID-19) pandemic in Seoul, South Korea, November 26, 2020. REUTERS/Kim Hong-Ji

A woman takes photographs of Christmas illuminations amid the coronavirus disease (COVID-19) pandemic in Seoul, South Korea, November 26, 2020. REUTERS/Kim Hong-Ji

A Santa Claus toy is seen on display at a traditional market amid the coronavirus disease (COVID-19) pandemic in Seoul, South Korea, November 26, 2020. REUTERS/Kim Hong-Ji

A man stands next to a street vendor as Christmas illuminations is seen in front of a department store amid the coronavirus disease (COVID-19) pandemic in Seoul, South Korea, November 26, 2020. REUTERS/Kim Hong-Ji

Pedestrians walk underneath Christmas illuminations in front of a department store amid the coronavirus disease (COVID-19) pandemic in Seoul, South Korea, November 26, 2020. REUTERS/Kim Hong-Ji

People stand in front of a Christmas season themed department store amid the coronavirus disease (COVID-19) pandemic in Seoul, South Korea, November 26, 2020. REUTERS/Kim Hong-Ji

People walk on a zebra crossing in front of a department store in Christmas season themed decorations amid the coronavirus disease (COVID-19) pandemic in Seoul, South Korea, November 26, 2020. REUTERS/Kim Hong-Ji

Women walks underneath Christmas illuminations in front of a department store amid the coronavirus disease (COVID-19) pandemic in Seoul, South Korea, November 26, 2020. REUTERS/Kim Hong-Ji

People wait for their bus at a bus stop amid the coronavirus disease (COVID-19) pandemic in Seoul, South Korea, November 26, 2020. REUTERS/Kim Hong-Ji

A shopkeeper waits for customers next to Christmas decorations at a traditional market amid the coronavirus disease (COVID-19) pandemic in Seoul, South Korea, November 26, 2020. REUTERS/Kim Hong-Ji

A shopkeeper waits for customers behind dried fish at a traditional market amid the coronavirus disease (COVID-19) pandemic in Seoul, South Korea, November 26, 2020. REUTERS/Kim Hong-Ji

Women walk in an empty shopping district amid the coronavirus disease (COVID-19) pandemic in Seoul, South Korea, November 26, 2020. REUTERS/Kim Hong-Ji

Women buy donuts at a traditional market amid the coronavirus disease (COVID-19) pandemic in Seoul, South Korea, November 26, 2020. REUTERS/Kim Hong-Ji

A couple walks in an empty shopping district amid the coronavirus disease (COVID-19) pandemic in Seoul, South Korea, November 26, 2020. REUTERS/Kim Hong-Ji

Chinese Foreign Minister Wang Yi talks with South Korean Foreign Minister Kang Kyung-wha during their meeting at the foreign ministry in Seoul, South Korea, November 26, 2020. Kim Min-hee/Pool via REUTERS

Chinese Foreign Minister Wang Yi talks with South Korean Foreign Minister Kang Kyung-wha during their meeting at the foreign ministry in Seoul, South Korea, November 26, 2020. Kim Min-hee/Pool via REUTERS

Chinese Foreign Minister Wang Yi talks with South Korean Foreign Minister Kang Kyung-wha during their meeting at the foreign ministry in Seoul, South Korea, November 26, 2020. Kim Min-hee/Pool via REUTERS

Chinese Foreign Minister Wang Yi talks with South Korean Foreign Minister Kang Kyung-wha (R) during their meeting at the foreign ministry in Seoul, South Korea, November 26, 2020. Kim Min-hee/Pool via REUTERS

South Korean Foreign Minister Kang Kyung-wha talks with Chinese Foreign Minister Wang Yi during their meeting at the foreign ministry in Seoul, South Korea, November 26, 2020. Kim Min-hee/Pool via REUTERS

Chinese Foreign Minister Wang Yi (L) and South Korean Foreign Minister Kang Kyung-wha (R) look on prior to their meeting at the foreign ministry in Seoul, South Korea, November 26, 2020. Kim Min-hee/Pool via REUTERS

Chinese Foreign Minister Wang Yi (L) and South Korean Foreign Minister Kang Kyung-wha (R) prior to their meeting at the foreign ministry in Seoul, South Korea, November 26, 2020. Kim Min-hee/Pool via REUTERS

Chinese Foreign Minister Wang Yi (L) and South Korean Foreign Minister Kang Kyung-wha (R) greet prior to their meeting at the foreign ministry in Seoul, South Korea, November 26, 2020. Kim Min-hee/Pool via REUTERS

A beggar wearing protective mask sits on a street amid the coronavirus disease (COVID-19) pandemic in Seoul, South Korea, November 25, 2020. REUTERS/Kim Hong-Ji

A restaurant owner waits for a customer amid the coronavirus disease (COVID-19) pandemic in Seoul, South Korea, November 25, 2020. REUTERS/Kim Hong-Ji

An elderly man wearing a mask plays Korean chess outside a park which is temporarily closed due to concerns for the spread of coronavirus disease (COVID-19) in Seoul, South Korea, November 25, 2020. REUTERS/Kim Hong-Ji

Elderly men wearing masks gather to play Korean chess outside a park which is temporarily closed due to concerns for the spread of coronavirus disease (COVID-19) in Seoul, South Korea, November 25, 2020. REUTERS/Kim Hong-Ji

Elderly men wearing masks gather to play Korean chess outside a park which is temporarily closed due to concerns for the spread of coronavirus disease (COVID-19) in Seoul, South Korea, November 25, 2020. REUTERS/Kim Hong-Ji

Elderly men wearing masks gather to play Korean chess outside a park which is temporarily closed due to concerns for the spread of coronavirus disease (COVID-19) in Seoul, South Korea, November 25, 2020. REUTERS/Kim Hong-Ji

A visitors' list and sanitizer are placed in front of a bbq restaurant amid the coronavirus disease (COVID-19) pandemic at a shopping district in Seoul, South Korea, November 24, 2020. REUTERS/Kim Hong-Ji

Women eat meal at a restaurant amid the coronavirus disease (COVID-19) pandemic in Seoul, South Korea, November 24, 2020. REUTERS/Kim Hong-Ji

A shopkeeper waits for customers outside a bbq restaurant amid the coronavirus disease (COVID-19) pandemic at a shopping district in Seoul, South Korea, November 24, 2020. REUTERS/Kim Hong-Ji

A couple walks on an empty shopping district amid the coronavirus disease (COVID-19) pandemic in Seoul, South Korea, November 24, 2020. REUTERS/Kim Hong-Ji

People walk past a worker in Japanese animation character Doraemon costume amid the coronavirus disease (COVID-19) pandemic at a shopping district in Seoul, South Korea, November 24, 2020. REUTERS/Kim Hong-Ji

A woman looks at her mobile phone next to an exit of a subway station amid the coronavirus disease (COVID-19) pandemic at a shopping district in Seoul, South Korea, November 24, 2020. REUTERS/Kim Hong-Ji

Members of Clean Hikers rest as they collect litter while hiking near the peak of a mountain in Incheon, South Korea, November 16, 2020. Picture taken November 16, 2020. REUTERS/Kim Hong-ji

Drawings by Kim Kang-Eun, an artist who leads Clean Hikers, and her colleagues are seen on a mountain in Incheon, South Korea, November 16, 2020. Picture taken November 16, 2020. REUTERS/Kim Hong-ji

Kim Kang-Eun, an artist who leads Clean Hikers, collects litter while hiking a mountain in Incheon, South Korea, November 16, 2020. Picture taken November 16, 2020. REUTERS/Kim Hong-Ji

Members of Clean Hikers collect litter while hiking a mountain in Incheon, South Korea, November 16, 2020. Picture taken November 16, 2020. REUTERS/Kim Hong-Ji

Members of Clean Hikers sort out litters they collected while hiking on the peak of a mountain in Incheon, South Korea, November 16, 2020. Picture taken November 16, 2020. REUTERS/Kim Hong-Ji

Kim Kang-Eun, an artist who leads Clean Hikers, poses artwork made from litter collected by members of Clean Hikers during their hikes, on the peak of a mountain in Incheon, South Korea, November 16, 2020. Picture taken November 16, 2020. REUTERS/Kim Hong-Ji

A stray cat wanders near an artwork made from litter collected by members of Clean Hikers during their hikes, on the peak of a mountain in Incheon, South Korea, November 16, 2020. Picture taken November 16, 2020. REUTERS/Kim Hong-Ji TPX IMAGES OF THE DAY

Kim Kang-Eun, an artist who leads Clean Hikers, and her colleagues pose with their artwork made from litter collected during their hikes, on the peak of a mountain in Incheon, South Korea, November 16, 2020. Picture taken November 16, 2020. REUTERS/Kim Hong-Ji

A member of Clean Hikers collects litter while hiking a mountain in Incheon, South Korea, November 16, 2020. Picture taken November 16, 2020. REUTERS/Kim Hong-Ji

Kim Kang-Eun, an artist who leads Clean Hikers, gets ready with her colleagues to collect litter while hiking a mountain in Incheon, South Korea, November 16, 2020. Picture taken November 16, 2020. REUTERS/Kim Hong-Ji

A face mask is seen among fallen leaves on a mountain in Incheon, South Korea, November 16, 2020. Picture taken November 16, 2020. REUTERS/Kim Hong-Ji

Kim Kang-Eun, an artist who leads Clean Hikers, collects a litter while hiking a mountain in Incheon, South Korea, November 16, 2020. Picture taken November 16, 2020. REUTERS/Kim Hong-Ji

An artwork made from litter collected by members of Clean Hikers during their hikes, is seen on the peak of a mountain in Incheon, South Korea, November 16, 2020. Picture taken November 16, 2020. REUTERS/Kim Hong-Ji

Kim Kang-Eun, an artist who leads Clean Hikers, and her colleagues pose with signs bearing a message for hikers on a mountain in Incheon, South Korea, November 16, 2020. Picture taken November 16, 2020. REUTERS/Kim Hong-ji

Members of Clean Hikers make an artwork with litter they collected while hiking on the peak of a mountain in Incheon, South Korea, November 16, 2020. Picture taken November 16, 2020. REUTERS/Kim Hong-Ji

A member of Clean Hikers poses with a face mask found among litter on a mountain in Incheon, South Korea, November 16, 2020. Picture taken November 16, 2020. REUTERS/Kim Hong-Ji

Parcel delivery workers sort parcels at a Hanjin Transportation distribution centre in Gwangju, South Korea, November 10, 2020. Picture taken November 10, 2020. REUTERS/Kim Hong-Ji REFILE - CORRECTING NAME OF COMPANY

Jeong Sang-rok, a parcel delivery worker for Hanjin Transportation, drives his truck in Gwangju, South Korea, November 10, 2020. Picture taken November 10, 2020. REUTERS/Kim Hong-Ji REFILE - CORRECTING NAME OF COMPANY

Parcels are seen on conveyor belts near delivery trucks parked at a Hanjin Transportation distribution centre in Gwangju, South Korea, November 10, 2020. Picture taken November 10, 2020. REUTERS/Kim Hong-Ji REFILE - CORRECTING NAME OF COMPANY

A worker monitors parcels on a conveyor belt at a Hanjin Transportation distribution centre in Gwangju, South Korea, November 10, 2020. Picture taken November 10, 2020. REUTERS/Kim Hong-Ji REFILE - CORRECTING NAME OF COMPANY