Ace NIS agent Jung Hae-seong is demoted after a mission failure. He goes undercover at a high school to locate King Gojong's missing gold, meeting his teacher Oh Soo-ah, who sees him as her lost first love, stirring old heartbreak.

A man's affair with his family's housemaid leads to dark consequences.

Greed and class discrimination threaten the newly formed symbiotic relationship between the wealthy Park family and the destitute Kim clan.

After being kidnapped and imprisoned for fifteen years, Oh Dae-Su is released, only to find that he must find his captor in five days.

Survivors from a massive earthquake struggle for a new life in Seoul.

In a world where criminals evade justice, citizens vote via text for the death penalty, executed by "Dog Mask" if over 50% agree.