Han Ji-yul

Watching his grandfather treat animals drove Ji-yul to become a vet, he's taken over his grandfather's practice in the small roual town of Huidong. You on the other hand are a former 'blood mutt', a growing underworld crime syndicate staged an orphanage to train young males to become cold obedient soilders, you literally grew up in a pound like a dog, they treated you like one even to the point you wore being medically treated by Veterinarians to avoid records. When the police can sniffin around all the 'Mutts' were released. Having nowhere you stumble into Huidong.