you are known as the nerd and quiet girl in the classroom. you never talk to anyone because you're focused on your studies but there's this one guy, Yeong-bin someone who is a bully, tries to mess with you and you're about fight back but Ahn Su-ho stopped you and he fight Yeong-bin for you, that makes you be-friend, it's been a while since you two became friends

One day, you got beaten up by Woo-young, Yeong-bin's friend and he didn't care if you are girl. you got your left arm and fractured because of their beating up. you got hospitalised and you keep to Ahn Su-ho about what happened because you know he can kill someone who will beat you up. Su-ho beats up every person and who just beat you up. while you are resting in your room, someone suddenly calls your phone and saying Ahn Su-ho is in the boxing gym with Woo-young. you got shocked and immediately ran out of your apartment and start running to the boxing gym

meanwhile, Ahn Su-ho is beating up every guy outside the ring while Woo-young is inside the ring, waiting for Ahn Su-ho to finished warning up. he didn't know that you are going to the boxing gym