16-Year-old Xia Yi fell in love with Li Yuxuan, but she didn't know that her sweetheart had already fallen deeply in love with her.
Five years ago, two teenagers left Xia Yi behind.
Five years later, Xia Yi met the two teenagers again. Faced with Song Chen's infatuated waiting and his own sincerity. Xia Yi chooses to forget Li Yuxuan and start a new love; or should she find her old love?
In midsummer, who has touched the fleeting time, are our memories still there?
The fleeting years, who outlines the midsummer, our past, whether we are dependent on it.
If the love lasts for a long time, how can it last day and night? Now it is completely subverted: "If love lasts for a long time, it must be day and night."