Dreaming Back to the Ambition of Guan Ping in the Three Kingdoms

The protagonist traveled back to the Three Kingdoms and became Guan Ping, the son of Guan Yu. Originally it was a dead end situation where Guan Yu was attacked from both sides. Let's see how the protagonist changes his destiny against the will of heaven and competes with the famous generals of the Three Kingdoms such as Cao Ren, Lu Meng and Lu Xun. Jiangdong encounters a mysterious old man who presents him with a strange book. What kind of shocking secret is hidden in the troubled times behind the Three Kingdoms? (For a novel that emphasizes trickery and strategy, if you open Goldfinger, you really can't think of any other way to keep the protagonist alive.)