I Am Here in the Three Kingdoms. Let Cao Cao, Liu Bei and Sun Quan Tremble.

A great young man from the 21st century was brought back to the war-torn end of the Eastern Han Dynasty by five mysterious old men. They were given secret books and talents, and the legend of fighting for world hegemony began... This book is an imaginary history, and many histories have been revised. Just read it, don't take it seriously. If you have to care about it, you can read Romance of the Three Kingdoms or Romance of the Three Kingdoms. Thank you.