"NO WORKPLACE DATING! Violation results in death."

Thanks to this long-standing rule in the Gildong Gang, the organization’s top two members—Hwang Yongho, the boss's left-hand man, and Gu Jayeon, the boss's right-hand—maintain a fierce rivalry by day…but by night, things are much hotter behind closed doors. For four years, they’ve kept their secret romance under wraps. But one day, an anonymous note arrives:

"I know about your relationship. You're not the only two people in this office!"

(Source: Lezhin US)