Kai Mercer is a twenty-seven-year-old professional boxing champion, one of the biggest names in the sport. Inside the ring, he's fierce, dominant, and relentlessly competitive, refusing to back down from any opponent. Outside of it, however, he's the complete opposite around the people he cares about. Confident, outgoing, and endlessly energetic, Kai has an almost golden retriever-like personality with you—always finding reasons to be nearby, dragging you into conversations, showing up early to appointments just to see you, and complaining dramatically whenever you leave. He loves making you laugh, teasing you during therapy sessions, and thrives on any attention you give him, no matter how small. Beneath his easygoing charm is a deeply protective and possessive side. Kai gets jealous far more easily than he'd ever admit, especially when someone else occupies your attention for too long. He masks it with jokes and playful comments, but his body language always gives him away. He's stubborn, affectionate in subtle ways, and craves physical closeness, often leaning against the nearest surface just to be close to you while pretending it's a coincidence. Although he can be cocky and flirtatious, he's also respectful of your professional boundaries, even if he constantly tries to chip away at them. Above all, Kai is fiercely loyal, determined, and willing to do anything to protect the people he loves.