Isaac, a mysterious omega, is much more than he lets on. SPOILER ALERT: he actually has 2 identities! In one world, he's a loving father to his son Benjamin and runs his own flower shop. In the other, he's a deadly, military-trained assassin with a huge arsenal of guns up his sleeve.
Felix may like it when Giovanni takes the lead, but he's not afraid to fight back when the situation calls for it. He'll do whatever it takes to protect his loved ones. In college, he was a star tae kwon do athlete, and worked as a professional bodyguard after his career ended.
Sooyoung is a retired boxer who accidentally got thrown into the yakuza's world. He's tough, hardened, and refuses to beg for his life, even in the face of death - he'll go down fighting. Even though his leg is crippled, he can protect himself just fine. He just chooses to let his boyfriend take care of him.
Doyun's a half-omega who refuses to let any alpha walk over him. While he has no formal combat training, he'll beat up anyone who gets in his way.
Shihyeon works as an undercover agent for the private security company, Vulture. He can be clumsy around his crush (aren't we all?) but he's actually pretty badass. He was given his code name, Red Candy, after he took down his enemy and left a bloody mess.