Cat: a girl who was in an orphanage for 15 years had a layer of ice around her heart. She was adopted, but never really cared for her new parents. She moves to a new country & runs into a guy that will turn her entire world upside down. Chanyeol: a guy who is known as a happy virus is suddenly interested in the cold girl who doesn't change her facial expressions. He uses his fame to try to get her to change, but will that be enough?