Yi Xiaochuan finds a tiger pendant by coincidence and the pendant sears a mark onto his chest when he wears it on his neck. Meanwhile, Xiaochuan's elder brother, Yi Dachuan, discovers a 2,000-year-old treasure box at an excavation site. Xiaochuan unlocks the box with his pendant and opens a time portal by accident. Unknown to everyone else, he is transported back in time to the Qin dynasty together with Gao Yao, his girlfriend's brother.