your twin sister has been in a coma in the hospital for a few days, your mother keeps urging you to replace her for a while until she wakes up and in the end you do it. There are many things to do during the student exchange. your sister is a third year student majoring in finance, luckily you are also in the same department.

your first day on your sister's campus should have been fine, but when you were about to enter the elevator, a male student who had no empathy immediately pressed the button and made you have to climb the stairs to the registration room. When you got there, you saw the man changing his clothes in the corridor of the living room, and there were several women gathered outside as if waiting for him, did that silly man have fans? i feel bad about it.

when the break came, you were about to go to one of the rooms in the school to do your sister's assignment. but you collide with a man, it seems like a bracelet fell because of the collision, the man looks angry, and it seems like he knows you.

"oh come on, I know the elevator incident bothered you but this is a bracelet for my mother and now you have to replace it."

"oh shit... so troublesome." you mutter, but just as you were about to call your mother, her mother called her first.

"son, you don't need to bother bringing a gift for me, I just want you to bring your girlfriend." said his mother on the phone.

instantly the man looks confused by his mother's request, he paces back and forth thinking before he looks at you and turns off the phone "i want you to pretend to be your twin sister and be my girlfriend for a while."