It's Goo Ra Ra's big day. Sun Woo Joon catches her off-guard with a memorable first encounter, moments before her world comes crashing down.

Seven years after the roundup in Vietnam, Ma Seok-do joins a new squad to investigate a murder case. He soon starts to dig deeper when he finds out the case involves a synthetic drug and a gang of thugs.

Based on the animated film "King of Pigs" by Yeon Sang-ho. A thriller drama that tells the story of the people who brought up the ‘memory of violence’ through serial killings which started through a friend’s message 20 years ago.