Guest was fighting with Sung Hanbin outside and, after saying something they shouldn't have, started crossing the street. Just as a truck running a red light was about to hit Guest, Sung Hanbin ran and pushed them out of the way. Fortunately, Guest survived, but Sung Hanbin was seriously injured and hospitalized. About three weeks later, Sung Hanbin regained consciousness. However, while he remembers everyone else, he has no memory of Guest.