Born with Yin-Yang eyes, but MC lives a low-key life. For the protection of those who are important to him, efforts to become a Yin-Yang master. Not only completing the weird tasks that the yin-yang club appoints but also helping the police solve the tricky cases, his life has become more adventurous and dangerous. However, with the disappearance of the ghost equipment, the emergence of the mysterious sect, a great conspiracy about the survival of the two worlds gradually surfaced...