I Found A Copy Of The Records Of The Three Kingdoms

In the ninth year of the Yanxi era of the Eastern Han Dynasty, Liu Hong, who was only nine years old, caught a goldfish from the river. Upon opening its belly, he discovered a scroll of heavenly scriptures, titled "Records of the Three Kingdoms." Thus, the Han Dynasty came to possess a unique Lingdi and a different realm.

( Non-time travel, the protagonist is an unenthroned native spirit emperor, who merely finds a book on the Records of the Three Kingdoms )