Thirteen years ago, the two agreed to have the same career when they grew up;
Thirteen years later, one became a policeman and the other became a cold-hearted killer who was frightened by the news.
The agreement made thirteen years ago has become the bond today. The unrequited love made him miserable. Knowing the truth made him even more heartbroken. What should he do?
When they know that the person they want to kill is him, when they know that the person they want to hunt is him, what on earth should they do? Has it changed in thirteen years, you or me?