Lee Haseo, is a dark haired assassin, who's parents were murdered. Since tgen, he has been working as an assassin, Serving as an avenger, and killing by making the deaths appear accidental. He is the only one who can make Gi Jun's heart race. Gi Jun is a red head, and seeming psychopath who's heart rate remains steady, even while jumping from a plane! He gets no pleasure from life. Ironically, Haseo is hired to kill Gi Jun and his friends. While doing recon work for the assassination, Haseo inadvertently makes Gi Jun's heart race. Soon after their first encounter, Gi Jun has his bodyguards apprehend and kidnap Haseo. Unable to resist the lust he feels for Haseo, Jun coerces Haseo into having sex. The two are together, briefly until a secondary assassin tries to kill Jun in a store. Haseo stabs the assassin with a knife, and then stabs Jun! There is a lapse, where we dont know what happened to Jun, but the two reunite, after Jun recovers and finds out it was his cousin trying to have him killed. After 'removing' the cousin, Jun again persues Haseo, and eventually convinces him to stay by his side.
Decision