Seven years after the roundup in Vietnam, Ma Seok-do joins a new squad to investigate a murder case. Soon, he finds out this case involves busting a synthetic drug and starts to dig deeper. Meanwhile, the guy behind it all - Joo Sung-chul - doesn't stop looking for trouble, and the Japanese drug distributors, Ricky and his gang, come to Korea to join the chaos. Things are just about to get out of hand.