Minho, a handsome German Shepherd, is Seoul's No 1 police tracking dog. One day he met a pretty chihuahua and fell head over heels in love.

Sunggyu's blissful household crumbled down right before his eyes after her sister was taken away. He grew up craving for his mother's attention which disappeared along with his sister. On his journey in search for his lost sister, he met Sungjong, another boy from a broken home.