How many hurdles does Lin Beixing not cross?

Lin Beixing didn't travel through 25 episodes, but Lin Beixing traveled through time and space by deleting short messages on old mobile phones. Lin Beixing deleted the last message on the old mobile phone, traveled back through time and space to save Zhang Wansen, and finally failed. After the operation failed, Lin Beixing was heartbroken and stumbled upon Zhang Wansen's former friend Mai. It turned out that Mai was killed by mistake, spent several years in prison, and came out to work in a garage.

Wheat saw that Lin Beixing had broken up with Yu Zhan, so he gave Zhang Wansen's mobile phone and diary to Lin Beixing. Lin Beixing read Zhang Wansen's diary and realized that Zhang Wansen's regret is the key to time and space. Every time Lin Beixing crossed back, it was a moment when Zhang Wansen felt sorry. Zhang Wansen's mobile phone has a confession message sent to Lin Beixing that year. Lin Beixing completed the last crossing by deleting the last message "I like you" on Zhang Wansen's mobile phone.