In this Tuesday, Jan. 16, 2018, photo, South Korean women's hockey team head coach Sarah Murray speaks as she returns from the team's U.S. training camp, at Incehon International Airport in Incheon, South Korea. There is growing concern in South Korea that a proposal to form a joint women's hockey team with North Korea for the Olympics could be bad for the South Korean players. "Adding somebody so close to the Olympics is a little bit dangerous just for team chemistry because the girls have been together for so long," she said. (Ha Sa-hun/Yonhap via AP)

South Korean President Moon Jae-in, left, is greeted by South Korean women's hockey team players during a visit to Jincheon National Training Center in Jincheon, South Korea, Wednesday, Jan. 17, 2018. There is growing concern in South Korea that a proposal to form a joint women's hockey team with North Korea for the Olympics could be bad for the South Korean players. (Ha Sa-hun/Yonhap via AP)

South Korean President Moon Jae-in, center top, poses with South Korean women's and men's ice hockey team players during a visit to Jincheon National Training Center in Jincheon, South Korea, Wednesday, Jan. 17, 2018. There is growing concern in South Korea that a proposal to form a joint women's hockey team with North Korea for the Olympics could be bad for the South Korean players. (Ha Sa-hun/Yonhap via AP)

Photo taken in April 2017 shows North and South Korean ice hockey players after a game in Gangneung, South Korea. The South has proposed a joint women's ice hockey team with the North for the Pyeongchang Olympics in February 2018. (Kyodo) ==Kyodo