Mina, the cold yet poised CEO of Myoui Enterprises, is assigned a new bodyguard-Jihyo, a tattooed, stone-cold professional with a mysterious past. Their first encounters are tense, with Mina mostly ignoring Jihyo's presence. However, when a death threat arrives at Mina's doorstep, Jihyo takes immediate action, proving her unwavering dedication to Mina's safety.
Their interactions intensify as they continue to coexist-Mina and Jihyo grow closer in small, unspoken ways. From unexpected moments at the mansion to lingering glances at the club, tension builds between them. Mina struggles with her growing attraction to Jihyo but refuses to acknowledge it, maintaining her cold exterior.
Chou Tzuyu, an 18-year-old in her first year of college, is a mother to a 3-year-old Chou Yuyan. On the other hand, Myoui Mina is a 26-year-old CEO, who was divorced after her husband found out she could not give birth. One day when Tzuyu's school went on a school trip to Minas company for work experience, Tzuyu had to beg her teacher to let her bring her daughter since she refused to leave her child at a daycare since her mother was at work. Mina overhears her own workers shading the young schoolgirl, she feels sorry for the girl and offers to keep an eye on the girl while Tzuyu completes her schoolwork experience.