Due to an accident, modern youth Lin Fan and cultivation saint Qi Zixiao cross worlds and swap identities. Facing an unfamiliar environment and vastly different rules, the two go from being flustered and prone to misunderstandings to gradually understanding and trusting each other. Lin Fan uses modern wisdom to help Qi Zixiao break through difficulties, while Qi Zixiao imparts cultivation methods to help Lin Fan grow. Having gone through numerous trials, they join hands to resolve crises and defeat powerful enemies, and while supporting each other, they build a deep bond to jointly welcome the brand-new challenges brought by the spiritual Qi recovery. Adapted from the novel "Suddenly Became Immortal, What Should I Do", authored by Huan Yan Xiao Yu