Have you ever had the thought, “If only I could go back to that year”? You think that with our current knowledge and mindset, we could change so many things if we returned to that time.

Hao Huigui, a 36-year-old university professor, finds that his life has not turned out as expected. The end seems inevitable. He yearns to go back to when he was 17, to that sunny and innocent time, to start over.

By chance, he truly goes back.

However, he doesn’t get a chance to start over.

He is still 36 years old. He becomes the head teacher of a senior year class. In that class, he meets his 17-year-old self—Liu Dazhi, a mess of a person. Hao Huigui knows Liu Dazhi’s future and both his happiness and misfortune. He wants to change him.

However, when the world-weariness of a 36-year-old meets the passion of a 17-year-old, things are not as simple as they seem…

If one day, you meet your past or future self, what would you think? Would you believe it? What would you say to them?

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