Tae-sik (Heo Joon-ho), a member of the Yukson clan, dreams of becoming the boss. He resents his brother Do-sik (Choi Jae-sung) for his mother's death, but Do-sik secretly helps him. As clan members disappear one by one, the boss suspects the rival Jaryong clan and assigns Tae-sik a mission. Meanwhile, the police investigate the case with Inspector Im (Jang Hang-sun) and rookie Officer Yoo (Yoo Hye-jung). They identify K as the mastermind behind the incidents, but grow desperate as they fail to grasp his true identity through their investigation, eventually discovering that K is Do-sik. Do-sik wants to end his life as a killer, but the death of his benefactor Papa and the danger Tae-sik faces force him into a perilous adventure. (Park Min)