Ian suspects that her biological older brother’s girlfriend—who’s about to marry him—may be having an affair with a coworker. To secure concrete evidence and stop the wedding within two months, Ian disguises herself and gets hired as the secretary to the CEO of the girlfriend’s company.

“Do you think lines exist to be crossed?”

CEO Cha Jeonghan, whom she ends up serving, has a handsome face—but a personality that’s anything but. He constantly gets under Ian’s skin.

“Yes. Lines are made to be crossed.”

Since Ian doesn’t care if she gets fired, she decides to cross Jeonghan’s boundaries whenever she pleases. And then, the arrogant man who never looked down from his pedestal…

“Did you put on makeup today?”
“Pardon?”
“It looks like you’re wearing lipstick.”

His attitude suddenly changes?

“This won’t do.”

Jeonghan leans over Ian as if collapsing onto her and speaks.

“What won’t?”
“I can’t let anyone see how you looked just now.”
“……”
“Cross the line with me only. You.”

A romantic comedy with a dangerously thrilling, rapidly shifting curve of emotions!