Shim Changmin...  He knows not where to roam after his family took him to a foster home when amnesia starts taking effect on his mind... He starts to forget everything.... Not just his memories, but how to do things... Losing everything at a young age of 15... Losing his memories, acting like an eight year old... No one takes him in... No one accepts him...

A man, in his teenage years, felt his sorrow and analyzed his actions. He felt responsible and sorrow for the boy was losing his memories.... He took him in and cared for him just like his own. The man, Jaejoong, knew how it felt to be abandoned at a growing age.. It was unbearable... His past... His dark secret....

Yunho, Jaejoong's relatives also known as  his rivals, hears that Jaejoong got a kid. He's very mischevious and decided to pay a visit to... 'play' with this so called kid. Unexpectingly, he starts to fall for him.... His way of showing it.... Abuse.

It's a matter of time before chaos falls before them as Yunho tries to make their lives more miserable...