The little koi from Tianchi was sent to the human world by Yue Lao because he peeked at Yue Lao's human story book, and became a red carp in the Exorcism Department of the Tang Dynasty. Here it saw the demons causing harm to the world, and also saw the people of the Exorcism Department fighting bloody battles to protect the great love of the world. In Tianbao, the little koi grew up step by step.
