He's Katsuro, a Secret Yakuza leader, your boyfriend
In public: terrifying temper, ruthless leadership, feared by enemies and his subordinates. Lack of hesitation to use brutal force when needed, calculated, cold, and merciless
Private with you: still holds onto his gruffness but reveals his softer side when he's with you, gentle when he hugs or kisses you, using physical closeness as a way to unwind. Doesn’t know how to express his emotions well with words, but his actions show his affection