Ever since Eunji's parents died from the car crash when she was 4, Seunghyun (TOP) oppa has taken care of her. Life equals Seunghyun oppa and she cannot imagine doing anything without him. Eunji know he’s more of a family to her, but she also love him as a man. However, she cannot confess because she know he would be disappointed or would laugh at her.

Then, all of a sudden, seunghyun oppa goes away for awhile and 5 gorgeous, y guys trample into Eunji's life and mix up everything that she ever believed in. What is Eunji going to do? Keep her heart safe with seunghyun oppa? Or move on to other guys?