1x14 - Come and Hug Me

During Jae Yi's shooting, the lights suddenly turn off. As soon as the lights turn back on, Do Jin finds Jae Yi trembling with fear. The shooting gets called off, and Do Jin shows her a photo of his own brother, Hyun Moo, and asks if she has seen him. He tells her that if she ever encounters him that she should run away because he is considered dangerous.