Why does the diary of exchange from heaven cycle endlessly?

Because the hostess will end her journey back to 1 years later at 6: 3 p.m. on the day when the college entrance examination ends, she directly returned to 1 years later, so she received Zhang Wansen's text message. Text messages are the mechanism of his circulation.

The main story is this: On the eve of her wedding, Lin Beixing was abandoned by her boyfriend who had been in love for eight years, and when she was collecting old things, she found the old mobile phone she used in high school. The hostess mistakenly deleted a short message and went back to the college entrance examination ten years ago, but at 6: 3 pm on the day when the college entrance examination ended, she would instantly return to real life. Later, I finally learned that Zhang Wansen fell from the lighthouse at 6: 3 pm on the day when the college entrance examination ended, which is the reason why Lin Beixing ended his journey and returned to ten years later. Therefore, the female host searched for the cause of the hero's death in the cycle of time and space crossing again and again.