After being abandoned by his parents when young, Gyun Heesung grew up in a casino. For the sake of his hyung, who took him in, he doesn't hesitate to put himself in harm's way. However, after an ambush, he finds himself injured and transformed back into his dog form. And upon waking up... Gyun Heesung suddenly became the pet dog of a predatory wolf. Though he now lives being showered with wholehearted care and affection, their cohabitation is somewhat unsettling.