30s/Male/Baptismal name: Michael/Priest After causing a major stir in Gudam-gu (see Season 1), he is living while hiding his killer smile. He comes to Busan and exerts his strength again to take down new villains Nam Du-heon and Kim Hong-sik. He is a teacher at the Busan Seminary. He has so much anger that one might wonder if he has intermittent explosive disorder.

30s/Female/Prosecutor After joining forces with Kim Hae-il to clean up Gudam-gu, she was living peacefully until she came to Busan at Hae-il's call. She addresses Hae-il as "Father."

30s/Male/Detective Initially, he had no intention of helping Hae-il, but after being persuaded, they took down the Gudam-gu gang together. He follows Hae-il to Busan (?) and fights alongside him for justice in the city. He addresses Hae-il as "Father."

40s/Former Mafia/Current Restaurant Owner He was a member of the mafia in the past, but he turned over a new leaf thanks to Hae-il's "tough love" (?). He addresses Hae-il as "Father."

20s/Female/Narcotics Detective She once pointed a gun at Hae-il (?), but now she has reformed and escorts Hae-il in Busan. She addresses Hae-il as "Father."

30s/Male/Main Villain The main villain of Season 2. He forces the elderly to manufacture drugs under the pretext of filial piety. He lives by the mindset that one mistake costs one life. He is a true psychopath and keeps several human shields/henchmen.

30s/Male/Prosecutor at Busan Southern District Office He joins hands with Kim Hong-sik to ruin South Korea and seeks to eliminate Kim Hae-il's crew. Why? Because they interfere with his plans. He dreams of reaching the top.

30s/Male/Leader of Yongsa Gang He is Kim Hong-sik's lackey (?). He is the center of the Yongsa Gang and handles connections behind the scenes for Kim Hong-sik and Nam Du-heon.

30s/Male/Baptismal name: Benedict A troublemaker at the seminary. He receives help from Hae-il and provides help in return. He is a kind-hearted aspiring priest who cares for the elderly and, much like Kim Hae-il (?), cannot stand to see injustice. He helps Hae-il fight the villains. A student at the Busan Seminary.