The protagonist travels through Cedric (atypical time travel). The timeline of this article is the end of the summer vacation of Harry's second grade in the Chamber of Secrets, which is also the summer vacation of Cedric's fourth grade and the beginning of fifth grade.
It's a serious drama, it belongs to the perspective of the non-protagonist group in the original work, with minor details and so on.
Not the Shuangwen route...
Intention: to be added