It seems that her older brother's fiancée—whom he is about to marry—is cheating on him with a coworker.

To find concrete evidence and stop the wedding within two months, Ian goes undercover as a secretary for the CEO of the company where her future sister-in-law works.

"Do you think boundaries exist just to be crossed?"

Cha Jeong-han, the CEO she suddenly ends up serving, has a handsome face but a terrible personality. He drives Ian crazy at every turn.

"Yes. Aren't lines meant to be crossed?"

Since she has no fear of being fired, Ian decides to freely cross the prickly CEO's boundaries whenever she pleases. But then, this arrogant man who acted high and mighty suddenly changes his tune.

"Did you wear makeup today?" "Pardon?" "It looks like you're wearing lipstick."

Why is his attitude suddenly shifting?

"I can't take it."

Jeong-han collapses on top of Ian, his body pressing against hers.

"Can't take what?" "The way you looked just now... I can't let anyone else see it." "......" "From now on, only cross the line with me."

A Romantic Comedy with a thrilling, unpredictable curve!