What's Wrong with Secretary Kim? S01E07 - Memories Should Stay Buried

Kim Mi-So is determined to find out more about her lost tragic memories of the past, she she asks Park Yoo-Sik if he knows something about Young-Joon's wounds. In the end she ends up believing that Sung-Yun is the boy from her past, more so because he too remembers it. Everybody goes camping on a team building and are surprised to see Young-Joon coming to join them.