"My beloved dog, whom I raised like my own child, turned out to be the heir of a chaebol family?!" It's been a year since Do-hoon adopted Janggun, who had been abandoned. This loyal companion not only became a family to the lonely Do-hoon but also led him to his fated love, Lee Chae-young. However, Chae-young was not an easy person to win over. Just as love began to blossom, a chaebol heir suddenly appeared, claiming Janggun as their own. And with that, Janggun's astonishing secret was revealed. Will Do-hoon be able to protect both his love and his family?