Young-joon reveals he never actually lost his memory. He faked amnesia as a child to protect his family after his older brother, Sung-yeon, developed twisted memories of the kidnapping to cope with his own guilt.

The couple deals with "jinxes"—a cracked mug for him and a scuffed heel for her—leading to a "newlywed-style" shopping trip for replacement mugs and shoes.

Manager Bong (Se-ra) tries to make Secretary Yang jealous by pretending another man is pursuing her.

In a sweet, vulnerable moment at his house, Young-joon sings Mi-so a lullaby to help her sleep, later kissing her forehead as she drifts off.

Secretary Yang responds with a creative confession: he gives her a bottle of cola with a hidden message written in marker on the plastic. As she drinks the soda, the message "Ms. Bong, you're cute. Would you be my girlfriend?" is revealed. What's Wrong with Secretary Kim Episode 12: Never alone

A fan-favourite sub-plot flourishes in this episode involving the office team.

Episode 12 of What’s Wrong With Secretary Kim is a pivotal turning point where years of family trauma are finally addressed, leading to deep emotional breakthroughs and a heightened romantic connection between Lee Young-joon and Kim Mi-so.

The episode concludes with a major romantic breakthrough. After Young-joon admits that being honest feels liberating, the tension between the two reaches a boiling point, ending with a passionate kiss on the couch. The Supporting Cast: The Soda Confession