The male protagonist whose business failed in 2025 accidentally traveled back to 1999 to re-attend high school. On campus, he, an "alien" from the future, was out of place. He also encountered various obstacles in his pursuit of love due to jealousy from his love rivals. The male protagonist knows that if emotional problems are not handled well, he will lose the love that he finally found. At the same time, the graduation season is approaching like a countdown. He must break through class differences before the deadline, resolve misunderstandings caused by time-traveling identities, and win the other person's heart. In this process, he has to overcome the shortcomings in ability caused by the differences of the times, be forced to make a choice in the confrontation between the time traveler and the native campus group, handle the emotional entanglements with his love rival and the person he likes, and finally gain love.
