Jinwoo is the only child of a wealthy family . his parents are always busy , so he grew into a quiet and introvert boy. because of that he wants to make others happy and not feel sad as his life.thats why he moved to this city.Mino is a man who is famous and always cheerfull in this university.people called him a happy virus.but they do not know that he kept deep wounds. Seungyoon is a genius man who moved to the city for college.he only had one dream, to be successful in order to make his mother happy and make his father regret for abandoned him from childhood. Taehyun an heir to the famous fashion company, arrogant and selfish , became heir is not his intention,the only one that he really wanted is freedom. Seunghoon come to this town for only one purpose, to forget the past that always haunted him since the tragic events.