Two assassins face off at a certain "workplace." The cool bounty hunter Chateau and the mysterious and powerful Ryang-Ha. Chateau and Ryang-Ha become enemies after this fight—at least, they should have, but for some reason Ryang-Ha takes a liking to Chateau and begins following her around. Little by little, Chateau develops a cooperative partnership with Ryang-Ha, which gets her caught up in the struggle against the organizations hunting him down. Furthermore, that battle is related to her past as well. Why did Ryang-Ha approach Chateau? What is Chateau's secret past?
Bounty hunter Chateau runs into an assassin named Ryang-ha Song while on a job. After their meeting, he ends up giving her information on other bounties. One day, a different job comes in and Ryang-ha ends up being the target.

Chateau goes to church on the anniversary of her father's death. She runs into Ryang-ha, who is his usual self, before they are met by an attacker. Meanwhile, Chateau's boss is meeting with her mother to try to understand her past.

Chateau boards a luxury cruise ship for a mission. There, she runs into Ryang-ha, who makes things difficult for her once again. They spend a night in a room together, in part so that Chateau can keep an eye on him.

Chateau leaves herself with Jinon and his associate, Nikka, in order to carry out her operation. Meanwhile, both the boss and Jim are put in danger.

Ryang-Ha confronts Donny, who had brought him here with some unresolved business. Meanwhile, Chateau makes a commitment to finding Ryang-Ha.

Two "Ryang-Has" survive desperately with a young Chateau. But Ryang-Ha is cornered by his enemies, and the other Ryang-Ha, too, is severely injured.
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