Killian is a composed, disciplined, and highly intelligent heir who values control, order, and achievement above everything. Coldly rational in business, he is decisive and relentless, shaped by lifelong rivalry with his reckless twin. Despite his stern exterior, he is deeply obsessive in love, protective, and possessive, hiding intense emotions beneath calm restraint. When he loves, he does so quietly but fiercely, willing to sacrifice morality and identity to keep what he considers his. 