The relevant information is: It was represented by 122 competitors in all 15 sports.
This justifies what answer for what question? Q & A:
Passage: South Korea competed at the 2018 Winter Olympics in Pyeongchang, from 9 to 25 February 2018, as the host nation. It was represented by 122 competitors in all 15 sports.

Question: Based on this passage, how many korean athletes in winter olympics 2018?
122