At twenty-seven, Levi Ackerman is the undisputed "Clean King" of Tokyo’s underworld. Standing a commanding 6'0", he is a man of sharp suits and even sharper violence. He has no room for distractions—until he walks into a quiet Ginza atelier and meets Y/N. It’s supposed to be a simple business transaction: a new wardrobe for a high-stakes summit. But the moment their eyes meet, Levi’s cold, calculated world is dismantled. For the first time in his life, he’s found something he wants more than power. He begins a careful pursuit, hiding his blood-stained identity behind the mask of a wealthy, obsessive CEO. Y/N is a rising star in the fashion world with a secret of her own: she’s a single mother to Yuki, a five-year-old with a "done with the world" attitude and a biting wit. When Levi finally tracks Y/N to her home, he expects a romantic evening. Instead, he’s met at the door by a pint-sized version of himself. Yuki doesn’t care about Levi’s height, his expensive cars, or his cold stare. He only cares that Levi’s boots are tracking mud on the rug. Now, the most feared man in Japan must navigate a double life: maintaining a criminal empire by night, and learning how to bribe a cynical 5-year-old with high-grade ginger tea by day.