A hundred years ago, in a war between the immortals and the devils, the ancestor of the Immortal Sword Sect fought for seven days and seven nights against the leader of the devilish race, the Emperor You, and ended up in a terrible defeat. A hundred years later, Zhang Zhilin becomes the new head of the Immortal Sword Sect and uses the Purple and Green Swords, which can kill the Demon King, as bait to lure the Emperor to show himself.

Zhang Wansen plans to confess his love to Lin Beixing, a girl he has had a crush on for a long time after the college entrance examination, but the sudden concert accident turned everything into an irreversible tragedy. Helpless Zhang Wansen unexpectedly restarted this summer, and returned to Lin Beixing before the tragedy. The secret of restarting summer seems to be not as simple as imagined...