Secret Couple

Disguised as a travel agent, Su Jee is a government spy with six years experience who is not allowed to reveal her career to her boyfriend Jae Joon. After she lies again, her boyfriend breaks up with her and leaves without notice, leaving her struggling alone with her sadness.

Three years later, while chasing an industrial spy in disguise as a cleaning lady, she happens to run into Jae Joon. He had become an international certified accountant, and seeing him throws her feelings into doubt.