Mandate of Heaven: Three Kingdoms

Reborn to the day before the Three Kingdoms game's servers open, the top strategist of the previous life's national server was betrayed by the person he trusted most. In this life, armed with a head full of walkthroughs and an iron token no one recognizes, he first saves a life (his grandmother's surgery fees), then takes the lead (first kill, founding a village, recruiting generals), then settles old scores (sending each betrayer off one by one), and finally overturns the heavens (the truth behind the iron token and the game's masterminds). — Description from novelcodex.orgFull novel: Mandate of Heaven: Three Kingdoms — read the rest free on N​o⁠v​e⁠l​C⁠o​d⁠e​x⁠.​o⁠r​g⁠