Black Is Not Straight, White Is Not Smooth

They have an inseparable bond. They have hard feelings. Six years ago, they evolved from childhood sweethearts to a young couple that everyone envied. Six years later, they were at odds with each other, but their bond reappeared~ He, the boss of the underworld, actually helped her, a wealthy daughter, to silently support her, and interfered in various ways while they were solving the case. But she, a white-blooded daughter, had close ties with the underworld boss. It's really black and white and not smooth... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.