Season 2

On the day of Father Gabriel Lee Yeongjun's fifth memorial Mass, a young altar boy at Gudam Church suddenly collapses, later revealed to be from a drug overdose. Father Michael Kim Haeil follows the trail to a dangerous district in Busan, a place rife with gangs, corrupt politicians, and dirty cops, all tied to a major drug cartel. Haeil heads to Busan with a message: God is watching. Disguised as a seminary instructor, he mentors students while secretly investigating the drug network preying on the vulnerable. At the heart of it all lies a complex web of crime. Haeil is determined to stop the senseless deaths, dismantle the forces of evil, and deliver divine justice to the wicked.

이영준 신부의 5주기 추모 미사가 열리던 날. 구담 성당의 어린 복사가 의문의 쇼크로 쓰러지고, 해일은 그 원인이 마약 중독이었음을 알게 된다.