Guilty office

Seo Kang-jae, who was Jung Sand's first senior and first love at the same time.
Jung Sande fell in love at first sight and secretly had a crush on him, but he got drunk at the farewell party when he heard the news of Seo Kang-jae's sudden resignation and came at Seo Kang-jae.
After that, Jung Morae dismissed sleep with Seo Kang-jae as a dark history and pretended not to know.
Sogang-jae also left without saying anything, and five years later, Sogang-jae returns as the executive director of the company he worked for and reunites with Jung Sand.
After coming back, Seo made a ridiculous threat to have sex 12 times for three months, citing Jeong's mistake. Jung, who wanted to resolve his insensitivity, accepted the threat and had a relationship, but everyone else sees him in a relationship….
A relationship that started in a mess, will it ever end in a happy ending?