Agent Kim Reactivated

In both series, we witness the arduous efforts of two fathers to save their daughters—fathers who have dedicated their entire lives to rescuing them. Both shows are spectacular and breathtaking.

The main characters in both possess exceptional fighting skills.
Both of them are former North Korean agents.
Both plots revolve around finding their daughters.

Kim is a single father raising his daughter while hiding a past he never tells her about, living what looks like a normal life as a bank manager. This reminded me a lot of Jeong Jin-man from A Shop for Killers, who raises his niece while running what seems to be a "simple hose business".

Both men spend several years pretending to be ordinary people, but they're actually incredibly skilled fighters with dangerous backgrounds. Jin-man was a mercenary leader, while Kim was a black ops agent. Jin-man's hose business is actually connected to a hidden weapons operation, while Kim keeps his past as a black ops agent a secret while living as an ordinary bank manager and single father.

The moment someone threatens the people they care about, that normal facade disappears and you get to see just how deadly they really are. Both are practically killing machines, taking down threats with superb efficiency. Jin-man is colder and more strict, while Kim is much warmer with his daughter, but both would go to any length to protect their family.

Both leads had complicated pasts and excellent special training in forces, and now they have to search for missing family members. And their victims will surely suffer.