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The secret behind the ever-evolving “Love Chair Lab” lies in the dedication of its employees, who throw themselves into their work with full devotion! “Ah! Mmph! Hanjun… You’re going in so deep, it feels incredible.” “Goya’s fucking amazing at biting too. The moment I step into the office, I can’t wait to dive right into you, you know?”

Im Shin Yoon, who lived his whole life as the eldest son of the Im family with four sisters full of personality, finds out at family dinner that Nam Chae-gwan, a mysterious chaebol who’s the best friend of his parents and lived a life of fortune isn’t just a really good friend of his parents. Nam Chae-gwan happens to also be his biological dad! Which makes Shin-Yoon the son of "Nam," so he receives an absurd proposal from Nam Chae-gwan, which makes his relationship with the four sisters unclear...

Eunhyuk finds himself in a room with his old crush and muse, Anna. Since the two parted on bad terms, the situation isn’t ideal. But if that isn’t bad enough, turns out that in order to get out of this room, they need to… have sex! With so much on the line, will the two be able to break out?