Sima Yi's "Luoshui Oath" is well known, and he has become a representative of renegade and treachery. However, why Sima Yi chose to swear by Luoshui may not be known. In August 25 AD, Liu Xiuqin, who had just pacified the north, led an army of 200,000 to the south and besieged Luoyang, but was stubbornly resisted by Luoyang's defender Zhu Kun. After months of unsuccessful siege, Liu Xiu faced the problem of food and food for the huge army, and the situation was very critical. In order to break the deadlock, Liu Xiu sent Cen Peng, Zhu Kun's old subordinate, to persuade him to surrender. However, Zhu Kun could not let go of his heart, and he did not dare to surrender to Liu Xiu, because he had formed a deep enmity under the first emperor Liu Xuan because of Liu Xiu's death. Zhu Kun felt guilty for Liu Xiu's death, and therefore could not surrender, fearing that once he was captured, Liu Xiu would definitely take revenge. After Cen Peng told Liu Xiu about Zhu Kun's distress, Liu Xiu said open-mindedly: "For the sake of big things, how can you be resentful because of personal enmity? If Zhu Kun has the intention of surrendering, I will protect his official title and will not cause harm. He swore by Luoshui, using Luoshui as a testimony that he would never break his word. Sure enough, after Zhu Kun surrendered, Liu Xiu kept his promise and appointed him as the general of Pingdi and the marquis of Fugou. Liu Xiu's sincerity and tolerance show the demeanor of a generation of heroes, and his "Luoshui Oath" has become a good story that has been praised for thousands of years.
More than 200 years later, in 249 AD, Luoshui once again witnessed a power struggle. Sima Yi took advantage of the opportunity of Emperor Cao Fang of Wei to leave Beijing to pay homage to Emperor Wei Ming, and staged a coup d'état to take control of Luoyang. Cao Shuang stayed in Yishui South to defend himself, forming a stalemate situation. At this critical moment, Sima Yi decided not to attack the city, but to persuade him to surrender. He pointed to Luo Shui and swore an oath, indicating that as long as Cao Shuang handed over his military power, he could protect the wealth and nobility of the officials. This scene reminds people of Liu Xiu's "Luoshui Oath". However, Sima Yi rebelled, and once he gained military power, he immediately imprisoned Cao Shuang and his henchmen, and exterminated his three clans on the charge of treason. Although Sima Yi's methods led to victory, he became infamous, and his righteous renegade became a ridicule for future generations.