The male lead, a top music graduate enamored with Sherlock Holmes, joins the police force alongside his childhood sweetheart, who is also an arts major. During a murder investigation, the two secretly head to the crime scene, only to be ambushed by the killer. Suddenly, they both find themselves transported back in time! The male lead awakens in the role of Li Yuanqing—assistant to the legendary detective Di Xiaoje—and embarks on a thrilling journey of solving ancient mysteries while frantically searching for the woman he lost in the time warp.