When hitmen are in love, they put both their lives and hearts at risk. Now only one question needs to be answered: is it to kiss… or to kill? Kant, a badass tattooist police informant, is asked to investigate a hitman brother duo. But when his attempt to dig up information by getting close to the younger brother, Bison, gets curbed by the overprotective big brother Fadel, Kant has no choice but to find someone to take Fadel out of the way. That's where Style, his good-looking foolhardy mechanic friend, comes in. Now the two friends are putting their lives, and hearts, on the line.
Captain Christ gives Kant his order to observe and collect intel on two hitman brothers, Bison and Fadel. While Kant finds an inroad through Bison, Fadel proves more difficult. Kant enlists the help of his best friend, Style, to try to win over Fadel's heart.
In an effort to get closer, Style begins following Fadel everywhere he goes. While Fadel maintains his tough exterior, Style has something of a breakthrough at the gym.
Lilly provides Fadel and Bison with their next target, but Bison's commitment to his hitman career is wavering.
Kant and Style both make major progress on their goal to start dating Fadel and Bison. Style learns he might be getting more than he bargained for.
Kant and Style find themselves actually falling for their hitman boyfriends. The two couples come together for a double date where Kant plans to take the next step in his investigative mission.
Fadel and Bison make their move against Ruerat, but when the police are already on the scene their suspicions are raised about a snitch.
Fadel and Bison plan their revenge on Style and Kant for their deception.
Bison is furious with Kant for lying to him; Style and Fadel meet a gay male couple in the countryside.
Fadel and Style reunite with Kant and Bison at Bison's childhood home, but not before an unknown shooter makes an attempt on their lives.
Fadel and Bison finally confront Ruerat, but what they learn in their encounter ensures their work isn't over yet.
Fadel and Bison question Lilly face-to-face at gunpoint; Kant chooses to negotiate a deal with the captain for the sake of Fadel and Bison.
Fadel and Bison must serve their five years in prison following their arrest, however, Kant and Style find ways for them to stay connected.
Complete episode guide for The Heart Killers with detailed information about every season and episode including air dates, summaries, ratings, and streaming availability in Japan.
This episode guide is organized by seasons, making it easy to track your viewing progress or find specific episodes. Use the episode information to plan your binge-watching sessions or catch up on missed episodes.