Eun Gyeol encounters Se Gyeong in her teens and learns a few things about her life that don't make sense in the future. Meanwhile, Yi Chan meets Chung Ah for the first time, but she doesn't say a word. Yi Chan tries to get away from Eun Gyeol, but Eun Gyeol follows him to the Snail Guesthouse and ends up becoming Yi Chan's math tutor. (Source: Viu)