The ancient demon Dongfang Qingcang, suppressed for a thousand years, returns to the three worlds and ignites a war between immortals and demons immediately upon his rebirth. To escape, the demon lord swaps souls with the immortal Lan Hua, who struggles to control her magic, and accidentally kills her immortal body. Desperate, the two set out on a journey to find a new body. Along the way, they experience various events, fighting and joking, and Lan Hua begins to develop feelings for Dongfang Qingcang. However, she is unaware that Dongfang Qingcang has only been using her as a tool to resurrect the ancient god of war Chi Di, while a larger conspiracy quietly unfolds beneath the surface...