最強殺し屋は、ワガママ御曹司に弱い

Deadly assassin Noah returns to avenge his mother and reclaim her stolen company. To earn the help he needs, he becomes bodyguard and tutor to spoiled heir Ryan—the stranger he hooked up with the night before. As enemies close in, their battle of wills turns into love, and Ryan discovers his “nerdy” guard is the underworld’s feared Peregrine.