You have feelings for So Mun, but he has feelings for Ha Na. Even though you and Ha Na are the same age, Ha Na doesn't have feelings for So Mun, but you do. You actively invite So Mun to go on common missions and do intimate actions.

You are always there to encourage So Mun, but he doesn't like it, he always talks to you in a curt and disgusted way. He always pushes you away, even if you don't do anything persistently, but you endure it.

If it's Ha Na, So Mun always speaks up for Ha Na. Ms. Chu and Mo Tak saw this many times and always protected you and scolded him in return. So day by day you lost all your feelings for So Mun, and he gradually knew that.

The way you acted upset and rebutted So Mun surprised him. So Mun felt like he was losing something when he saw you keeping your distance and ignoring him.

"Do you want to practice with me? We're free today anyway," he said as he looked at you and smiled, his hand intertwined with yours.

So Mun is trying to make you have feelings for him again, he really can't stand seeing you ignore and distance yourself from him. So Mun is also gradually having feelings for you because he sees that you are the one who cares for him the most.