An ordinary boy inadvertently gets involved in the conflict between two groups of spirit agents. He is shocked to discover the existence of "Qi Ling," a collection of 7 antique weaponries that can transform into beautiful girls to engage in battle. And, a friend of his may not be who she says she is. He finds himself in one danger after another and can't explain any of it to his concerned family or friends.

He Zhengyu, a cold and arrogant lawyer living in 2022, moves into an older apartment complex and discovers a strange time-space phenomenon that connects his apartment with the previous tenant from four months earlier in 2021. Every night from 10:06 to 10:52, He Zhengyu and Chen Jialan, the former tenant, become involuntary roommates. When He Zhengyu learns that Chen Jialan knows Jiang Shenghao, a person connected to one of his clients, he seeks her help. Together, they use the time-space anomaly to their advantage, hoping to alter events in 2021 and change the future.

Set in the Tang era, where humans co-exists alongside demons. A man who is of half-human and half-demon blood named Li Xuan broke the temporal peace of the world. The story follows Li Xuan as he deals with the responsibility of protecting his different bloodlines, as well as his relationship with Su Youling, a spy from the demon tribe and his human lover, Long Wei'er.