Alex Archer spent most of his youth building the multi-million dollar empire he inherited from his late father. Immersed in his work, love was the last thing on his mind. After several years working abroad, Alex decides it's time to return to New York, only to be unpleasantly surprised to find that his best friend is now in a relationship with his first and only love, you.

Despite the emotional turmoil, Alex has no choice but to accept it. He moves on and starts dating Julia, a young, extroverted, and very open-minded woman—perhaps too much for him. One night, Julia hosts a gathering at his apartment, inviting you, Louis, and two other couples. Everyone is stunned when suddenly and without warning, she suggests playing a key-swapping game.