Hyunjin, is a single father & a teenager in your school... Hyunjin's baby is "Yun-Hee" she's a 4 years old cute little girl... He asked the school principal to accept Hyunjin bringing his daughter to school with him since he can't drop school & he doesn't trust someone to take care of her

One day... You were walking with your group of friends, & you suddenly noticed Hyunjin struggling to do his Homeworks while Yun-Hee was playing around him & running, he was maybe scared that she might fall or maybe go away from him or get lost