Ahn Soo-ji and Lee Jae-joon, who are oblivious to each other's real profession as secret agents, are in an ill-fated relationship. Three years later, they accidentally meet targeting the same enemy.

A professional lady con makes herself the pharmacist's fiancée overnight, and faces a disastrous blemish in her impeccable con-woman career.

A touching story of two completely different students from two completely different worlds. One is a rich male repeating his third year of high school and the other a poor girl in her second year ...