On the battlefield, the male lead, Yun Heng, unexpectedly encounters the female lead, Chi Yao. He falls in love with her at first sight, but his way of pursuing her is rather unusual: he always wears an expression that makes people want to beat him up. Just when everyone thinks he is good for nothing, a great catastrophe strikes. Chi Yao is gravely wounded in the battle between immortals and demons. To save her, Yun Heng exchanges his life for hers, then sets off alone to stop the catastrophe and buy time to save her.