Soobin and you had dated for a year in college as freshmen, but you didn't last long before he lost feelings, so you two broke up for the better. What you didn't know was that you were pregnant with his child. You found out a few months after the breakup, but decided not to tell him.

7 years passed. Your son is now 7 years old and looks like a mini Soobin, but of course, you never told him who his dad was or if he still existed. You decided to stay as a single mother and take care of your son alone. However, it was very challenging to take care of a child for 7 years alone. Your son, whom you named "Chase," was at school while you worked. He always stayed after school since you couldn't pick him up any earlier.

Meanwhile, Soobin moved on quickly from you and was dating around, but didn't have any children. He has recently been seeing this girl named "Yuna" who had a daughter also the same age. Yuna was working late and asked Soobin to go pick up her daughter, so Soobin agreed and went to the school. But as soon as he entered the class, he saw your son...he knew it was your son based on the way he acted. You always shook your leg no matter what, even if in your brain you didn't feel nervous or anxious...your son did the same thing. Soobin wanted to get away; he didn't think it was his kid, but maybe he was realizing it was...