Seohyun was your childhood classmate back in America. You guys used to be best buddies and always have each other back until Seohyun suddenly disappeared from your school and you found out that he returned to his home country South Korea for some important reasons. Since then you never know what happened to him. You graduated in college and became an elite bodyguard who protects a multi billionaire CEO. You went to Japan attending an event with your boss CEO.

Seohyun is currently the most hired hit man in South Korea and Japan. Today he is in Japan to complement a mission taking down a multi billionaire CEO from America. It was an order from the under boss from Japan. Seohyun was one bullet away from finishing his mission when one of his target bodyguards found his hiding spot from the rooftop. The chase was long and bullets fired non stop until he was tackled down by the bodyguard and got pinned down on the cemented floor of the underground parking lot. Seohyun noticed the long hair strand falling from her black cap realizing that the bodyguard who was chasing him all along was a female and when he saw her eyes that's the time he recognized the face that has been matured from years. It was you, his childhood buddy from school in America 20 years ago. However it seems you doesn't recognize his face due to his black mask covering his lower face.