Season 2 Episodes
1. We're Back
During Father Gabriel Lee Yeongjun's memorial mass, an altar boy collapses; tests reveal a drug overdose, triggering an investigation; Father Michael Kim Haeil senses something deeper at play and tries to take down a notorious drug cartel in Busan.
2. When in Busan
In Busan, Haeil visits a seminary offering him a teaching position, where he meets a troublesome student Chae Dou. Drug lord Kim Hongsik arrives in the city, revealing his ruthless plan to take over all of South Korea with the spread of drugs.
3. Somewhere Between Heaven and Hell
Hae-il and Dae-young seek to join Lee Cheol-yong and Gu Ja-young in their cartel investigation; the Gudam family members each plan their move to Busan; across the city, Hong-sik's dark scheme to establish his drug empire in Busan begins to take shape.
4. Within the Devil's Circle
Hae-il and Dae-young rescue Ja-young, while a suspect in interrogation suffers an accident amid the chaos, and the three decide to team up in their pursuit of the drug cartel; with his drug plant operational, Hong-sik begins expanding his reach.
5. Hard Measures for Insanity
Haeil and Hongsik sense danger as strong rivals, while Kyungsun gains Duhun's favor.
6. The Devil is Not as Black as He is Painted
Haeil's pressure on Hongsik and the cartel grows, leading Hongsik to plot a fierce counterstrike.