It tells the story of Jeong Ba-reum (Lee Seung-gi), a well-known upright young man and patrol officer, as well as Go Moo-chi (Lee Hee-joon), a crime police officer who lost his parents to a murderer when he was a child and now lives for revenge. After they face the most vicious “predator”, who is known as the top 1% of mental patients, their fate is completely reversed....

It tells the story of Jeong Ba-reum (Lee Seung-gi), a well-known upright young man and patrol officer, as well as Go Moo-chi (Lee Hee-joon), a crime police officer who lost his parents to a murderer when he was a child and now lives for revenge. After they face the most vicious “predator”, who is known as the top 1% of mental patients, their fate is completely reversed....