At the age of 14, witnessing his family’s murder and a brutal blow to his head caused Changmin to lose all his memories. Now, at the age of 21, he travels all over Asia with his band mates, under the name of DBSK. He had always had always wanted to know what had happened in the past so that he is able to remember who the murderer of his family was. But his grandfather, who adopted him, forbade him to undertake any activity that will help him regain his memories. After arriving at Japan, he meets the composer for their latest song and she has the key to unlock his memories. As he delves deeper into his memories, will he ever find out about the dark secret that his grandfather has kept from him?

Han Soo Jin was born in Korea. There, she grew up with a boy named Lee Myung Ki. Both of them would play together and compose little tunes together as well. In short, they were best friends. One day, Myung Ki’s family was murdered and he had disappeared without a trace. The police had told her family that his grandfather had taken custody over him and had probably moved out of the country. Soo Jin was devastated but believed that both will meet one day. A few months later, she had to move to Japan because of family reasons and took a new name of Tanaka Aki. Still, she kept the faith that she’ll meet him one day.

Now, 8 years later, both finally meet and Aki agrees to help him to recover his memories for the sake of their friendship. But as Changmin starts to recover his memories, will his old bonds be kept or will the difference in the eight years change everything?