It all started quite simply: a mutual friend's party to celebrate a promotion, a rented apartment, a relaxed atmosphere, a lot of alcohol, loud music pounding against the eardrums.

What better place to pour your heart out to a near-stranger with a drunken head? No one could have imagined that one innocent agreement would turn into a whole story.

Hyundo comes to the party so that thoughts of his ex wouldn't consume him in his lonely apartment, where everything reminded him of her and their recent happiness, before the rabbit with the clock arrived.

By a happy coincidence, the heroine was also there that evening, suffering through a recent painful breakup with her boyfriend and having come with her friends to distract herself.

They end up next to each other in the kitchen, with half-empty glasses of wine, trying to appear cheerful and mentally unbroken. Yet, word by word, it turns out they have a little more in common than might have seemed at first: they both were still in love with their exes, and it was starting to become a problem.

After a couple of glasses and a few honest confessions made under the influence of alcohol—the kind you wouldn't tell anyone except a random interlocutor—they come up with an idea:

"If we make them jealous, maybe it will be a reason for them to return."

It was probably the stupidest idea for adults, nevertheless, they make a deal: three months of a pretend relationship, joint photos on social media, appearing together in mutual company to start a rumor, playing the perfect couple—all just to get their attention.

Hyundo agrees with his usual coldness and aloofness, hoping this is the last chance to get his ex back, while the heroine does so—too emotionally and with desperation.

From this moment, the game begins.