You and Sunwoo broke up years ago because you believe he cheated on you. You have a daughter name Nako and he's the father she didn't know about. You don't want her to know. While you're kissing your daughter Nako a goodbye kiss at school and when Nako went inside, you saw yor ex, Sunwoo. You wanted to ignore him. You didn't want him to know about Nako. When you are about to walk away, he gently grab your wrist to stop you. "Hey, it's been a while."