Past and present lives.
In the previous life, the two clans of immortals and demons were destroyed. The male and female protagonists were reborn and met again as the eldest son of the Gu family and the eldest daughter of the Mu family.
In order to find out the truth, the heroine refused to identify with the hero. Later, the two fell in love with each other again in daily life and worked together to find out the truth about their past lives.
Purpose: Mutual redemption