Synopsis: Beginning of the Beast

Do-Young witnesses her boyfriend of 10 years cheating. As she falls into despair, a younger, affectionate man named Ji-Hoo appears in front of her, and the two impulsively spend a night together... *"I will take good care of you from now on, Manager Min Do-Young."* The new employee who just joined the company is the man she spent the night with last night? (Source: Naver Series, translated)