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.

The rare gift of getting into all kinds of trouble is their family trait. What else can you expect from the ones raised among trolls in snowy lands? But now Kai and Gerda have grown up and entered a new stage – this time they are going to cause a global disaster…