While conducting a time-travel experiment with colleagues, Shangguan Jin accidentally slips 1,200 years into the past—to the ancient Jinshe Kingdom. But though she’s crossed time, her soul lands inside the body of Prince Zhan, the Third Prince of Jinshe—transforming her into a full-fledged man! Desperate to swap back, Shangguan Jin and Prince Zhan race against time, trying every method imaginable.