Hogwarts: Damn it, I became Voldemort

Cyrus traveled to the world of Harry Potter and thought that splendid magic was waiting for him. Unexpectedly, he replaced Voldemort’s soul in the diary and became “Tom Riddle”.
Cyrus: Damn it, I’ve become Voldemort!
Voldemort: Oops, I’m a substitute!
…
During the days when he stayed in the diary, Cyrus continued to learn and digest Riddle’s knowledge, waiting for the opportunity of resurrection. It wasn’t until the summer of 1992 that Ginny Weasley wrote down words in her diary for the first time…
(Internal investment has passed, investment is welcome)
—
Having learned the lesson from the collapse of the previous book, this time Once I made an outline, strengthened the main plot of the protagonist, and vowed that it would never be unfinished!