Lee Sungmin was the only one who survived from the car accident that killed both of his parents. He was then adopted by Kangin's parents and he will soon meet a lot of wonderful people in his new school.

To you, my precious one.... Live. I have seen the world long enough than you did. Let the world know that an impossible love between an immortal and a human could happen. Live for our love. Saranghae.

  Sungmin and Eunhyuk are best friends and have not been separated since they were both kids. They both care and love each other in a brotherly way, until one unfortunate night changes it all. They were both drunk and none of them wanted it to happen. Eunhyuk will soon get married with his lover in a couple of weeks and he felt guilty for what happened between him and S

Sungmin works as an undercover police agent, who was forced by his colleagues to work as a bodyguard of a brat known as Cho Kyuhyun (the heir of Cho Company that always gets himself in trouble all the time), stating that he needed a break (as a BODYGUARD?! - Sungmin) after his girlfriend's death.