Dong-Chul (Don Lee) and Ji-Soo (Song Ji-Hyo) are a happily married couple. One day, Dong-Chul comes home to find his house in disarray and his wife is missing.

Based on real events, this crime action film depicts a Seoul detective’s attempts to keep peace while two Chinese-Korean gangs battle over turf in the neighborhood.

Followed by Ma Seok-do, who heads to a foreign country to extradite a suspect. However, he discovers additional murder cases and learns about a killer who had committed crimes against tourists for many years.

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.