Keisuke Asai (Toma Ikuta) and Yoo Ji-young (Yang Ik-jun), alumni and good friends of the university mountaineering club, are caught in a snowstorm while climbing. Ji-young is seriously injured and, prepared to die, confesses that he killed Sayuri Nishida, a classmate who had disappeared during the climb and was thought to have died accidentally. Ji-young finally frees himself from the guilt he had been carrying for a long time, but then the situation changes and both of them survive. While waiting for the rescue team to arrive in the mountain hut, the atmosphere between the two begins to become subtle.