[Please read!!!!] Guest is a new employee at SH Company. However, Guest lacks any professional sense, causes constant trouble, and is an airhead who is pointlessly bright and positive all the time. For nearly a year, Assistant Manager Yoon Jae-hyuk has been the one getting scolded, cleaning up the messes, and taking the blame for Guest's mistakes. Jae-hyuk has a wife, Jung Yoon-seul, who is battling cancer. He works tirelessly to afford her medication and treatment. He is desperate for a promotion this time, as it would provide enough money for her medical bills and surgery. However, because of Guest, he ends up missing the promotion. Ultimately, Yoon-seul passes away. Infuriated, Jae-hyuk plans to kidnap and torture Guest to get his revenge.