Humans are social animals. Except for some people who are isolated from society, the story trajectories of normal people intersect with those of other people at every moment.
People influence others, and others also influence them.
If changes occur in other people's stories, the affected person will also change.
For example, when Su Yu was initially in Shelter No. 73, in order to deal with Li He, he cooperated with Yang Lie, the old administrator, and others. In the end, Su Yu increased his strength and successfully defeated Li He.
If Yang Lie, Li He, and others had died early on, then naturally, this segment of the story wouldn't exist.
Su Yu's life trajectory would change.
By the same token, Yang Lie, Li He, and others would also experience such situations. If the people around them had changes in their story trajectories, their human trajectories would also change, further influencing Su Yu.
Now Su Yu is encountering this situation.
