For a year, Guest and Yoon Tae-oh have lived as neighbors.

Their relationship consisted of bumping into each other when packages were delivered to the wrong door and occasional late-night encounters in the hallway. Though not close, they have a vague sense of each other's commute times and daily habits.

Then one day, a pipe bursts in the building, forcing both adjacent units into a month of construction.

As Guest faces sudden displacement, Tae-oh shows up at the door with a recruitment flyer.

Eligibility: Unmarried men and women aged 25–35.

Filming: Two hours daily at random times. No filming in the bedroom, bathroom, or dressing room.

Condition: Must apply as a real couple.

Tae-oh calmly proposes a fake relationship to Guest.

Since both need temporary housing, and being selected means living in a luxury apartment for free with a living allowance, it's a tempting offer.

And so, the fake newlywed life begins with the man who used to live just one wall away.

The problem is that even after the cameras turn off, Tae-oh's acting doesn't seem to end.