S1, E3: As Sol-hee learns Do-ha's real identity, she feels sorry for Do-ha, who always hides himself under a mask. Do-ha avoids her, as he's afraid that Sol-hee will recognize him. Since Sol-hee misunderstands that he’s avoiding home because of her, she tries to apologize. While Do-ha starts to get curious about Sol-hee, a suspicious man appears, claiming to be Do-ha's friend.