At the beginning, it tells the story of two young people and Xiao who mysteriously entered the time cycle because of a bus explosion accident. From mutual suspicion to the final cooperation, from trying to find an escape method to stop the bus explosion in time to rescue innocent passengers, and finally to find the murderer behind them, this exciting rescue process finally made them grow up and realized the value of life.

The beginning, starring Angel and Bai Jingting, is a brain-burning sci-fi drama. Although there are only 15 episodes, each episode is wonderful and exciting, and new things can be found in each episode. It can be said that it is a very good drama with a high reputation. The story is fascinating and the plot is ups and downs. Every time the protagonist enters the time cycle, it will bring new feelings to the audience.

Li Shiqing in the play is a college student. The No.45 bus she took is also a common bus at the school gate, but since she got on this bus, various bizarre experiences have happened one after another. First, she experienced a bus explosion accident, which was really a living experience. When she thought she was dead, she came back to the car like a dream.

After several such cycles, she was finally no longer lonely. She pulled He Yun Jr., a young man sitting next to her, out of the car. After they broke up because of a quarrel, she fainted and went to the roadside hospital. However, He Yun Jr. went to the hospital because his taxi was affected by the bus explosion, but he was declared dead.

While declaring death, He Yun Jr. woke up inexplicably from another place. As a result, he also entered the cycle of the bus era, and Li Shiqing around him finally had a companion. The two also experienced a cycle from quarreling to discussing the plan.