1. Survivor syndrome

This is a concept mentioned later, which explains the behavior in the police station on the surface, but actually implies the key to Wang Bus's monitoring of the last unreasonable behavior. Revealing the clues of the first hidden cycle, the whole beginning is carried out under this background.

2. The truth about Wang

Wang's story is that she experienced an accident for the first time, but only she survived and got survivor syndrome. She wants to save everyone. After many cycles, the only solution is to get off the bus and trade yourself for another life, which can also explain why the bus monitoring can't find her motivation. As for that phone call. I may just want to say goodbye to my family before ending this cycle.

The behavior of her sacrifice is incomprehensible to outsiders, just like the police in the main plot can't understand and the small behavior. So the truth of Wang is that she was the only survivor of the accident. Due to the hidden cycle caused by survivor syndrome, the "start" timeline was unfolded under her self-sacrifice.

3. Analysis of main facts

The cycle of the main line is the second cycle, which is the story derived from sacrificing oneself. Because of their own death, parents who didn't know the truth retaliated against society five years later, causing innocent casualties. Due to the influence of survivor syndrome on the first floor, her second form, Li Shiqing, was born on the second floor. This also explains why the details of clothes are similar.

Wang's true self doesn't want my parents to retaliate against the society because of this incident, and I want to stop it again. The second layer loop also applies the pattern of the first layer, but there is a hidden layer in the middle. Because every time you die instantly, you can't change the timeline, so let Xiao join, and the third layer is derived, which is the beginning of the small death cycle.

Since George W. He Yun joined, his physical condition has been deteriorating in every cycle, which corresponds to the time process of hospital rescue on the second floor and explosion death on the third floor. So the truth of the finale is that the sleep cycle on the third floor is over, because He Yun died, went back to the second floor and exploded, and then went back to the first floor.

Wang woke up on the bus five years ago. She thought that the happy ending of self-sacrifice did not happen according to her plan, but it took five years to make an impact. Then the story ends, and a new cycle begins five years ago, echoing the title of Start.