That night should've been the most beautiful and memorable night in the life of Lee Jinki a.k.a. Onew, together with his SHINee members, Jonghyun, Key, Minho and Taemin. Onew planned to propose to his girlfriend, Taeyeon whom he has been dating for 2 years. But on that same night, Taeyeon decided to end their relationship as she has been secretly dating another man, and chose that man over Onew. Onew was surely shocked and  definitely heart broken. 3

After that night Onew became depressed for many days, weeks and soon became many months, he would eat very little and would talk as less as possible. Onew refused to move on. The other SHINee members first let it off assuming that it would only last for a few days but they were wrong. 

After a failure of rehearsing for a concert, Key came up with the idea of contacting an agency that worked to motivate people and return to their normal selves. This agency was owned  by Kim Shelly, (YOU) an extraordinary, beautiful girl. Shelly accepts the mission to help Onew return to his normal self, forgetting his relationship with Taeyeon.