Liu Han, an international equestrian and mounted archery champion, accidentally traveled to the troubled times of the Three Kingdoms and became a general of the Yellow Turban Army, witnessing the horrors of burning, killing and looting with his own eyes. He has a righteous heart and is unwilling to associate with thieves, but he encounters the "Lord of Benevolence" Liu Bei on the battlefield, and after saving Liu Bei, he awakens the "One Punch Man-Infinite Strengthening System" - every exercise can increase his strength, speed, and intelligence infinitely!
Since then, Liu Han has emerged in troubled times with the help of force and modern military knowledge that transcended the times. He single-handedly killed thousands of soldiers, raided the enemy camp at night to burn the food and fodder, devised countermeasures to disrupt the enemy's conspiracy, and even defeated Lu Bu with a punch at Hulao Pass, which shocked the world! He is not only Liu Bei's strongest general, but also a key figure in troubled times.
However, as his strength increased, Liu Han gradually realized that his time travel was no accident. There seemed to be a shocking secret hidden behind the system that could subvert the structure of the Three Kingdoms. When Cao Cao, Sun Quan, Dong Zhuo and other forces are around, the world is in turmoil. Can Liu Han help Liu Bei unify the world? Can he uncover the truth about his time travel and change the destiny of history?
In troubled times, the Three Kingdoms fight with each other! Watch how the time traveler Liu Han writes his own invincible legend on his own!