Extraction from All Realms, Starting from Changing Historical Regrets

China has a history of five thousand years and countless regrets. Qin Shihuang, the remaining warrior of the sixth generation, unified the six countries, but died due to tyranny and civil strife in his second generation; Zhuge Liang dedicated his whole life, and the Northern Expedition was not completed yet, but he regretted it for the rest of his life because of God's jealousy of his talents; Yue Fei, who fought against the Jin Dynasty all his life and had great achievements, was unjustly killed by Song Gaozong on "unfounded" charges, and his dream of the Northern Expedition was shattered... Liu Tian, an ordinary college student, was accidentally bound to the "Changing Regret System" and gained the ability to travel across all realms, starting from changing the historical regret of the death of the second generation of the Qin Dynasty. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.