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 tragic love triangle story between Hwa-Yeon, a daughter of a nobleman, her true love Kwon-Yoo, a servant and the man who will be King, Prince Sungwon.

A high school student with amnesia tries to uncover what has happened to her. All leading her into deeper troubles ultimately revealing a darkness she could not have imagined.

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

A married South Korean man with 4 kids gets fired for being honest. Same day the family's house etc. is frozen due to having guaranteed his brother's defaulted loan. The family changes during the month given to pay the debt.