Traveling Through Hogwarts: Rewriting the Wizarding Wars

In the summer of 1971, when the shadow of war quietly enveloped the British wizarding world, unprecedented abnormalities occurred in the oldest magic deep in Hogwarts Castle. The pen of acceptance persistently writes the same name - Lin An - repeatedly on the book of admission, but the latter ruthlessly erases it with the same frequency. The owner of this name is a time traveler who firmly believes that he can become a giant of the times through his prophet. He originally planned a prosperous road to become a business giant in the Muggle world, until this uninvited owl completely shattered his blueprint - this is actually the world of Harry Potter! Facing a dark age in which he only knew the ending but not the details, Lin An's first reaction was to retreat: "Killing Voldemort is the mission of the savior Harry Potter, and I, a 'Mudblood,' am not going to die if I rush to the front line?" However, when the torrent of history carries him into encounters with young James Potter, Lily Evans, Severus Snape and others, and when the weight of friendship, responsibility and growth truly weighs on his shoulders, can he continue to be alone? How will this soul from the East use its traveler's wisdom and unique understanding of the magical world to leverage the fulcrum of fate and rewrite the ending in this dark and cruel war?