Have I Become the Villain Princess' Lackey?

In the past life game "Song", he became a slave fighter in the Colosseum. Fortunately, he had a plug-in and survived the battles with beasts. During a battle with beasts, he was accidentally spotted by the villain princess and became the villain princess's lackey. In the first year, the villain princess of the Gemir royal family looked at the knight under her command and gave him an evaluation: barely usable. The next year, during the battle for the ten kings, in order to become the most powerful contender for the throne, as the chief knight under the villain princess, he repeatedly completed his tasks outstandingly. He nodded lightly and said, "It has some effect." In the third year, the country was in turmoil. He annihilated the rebels externally and suppressed internally the rebel parties such as the Church and the Magic Society that tried to seize power. At the merit ceremony, the villain princess spoke highly of him: "Excellent." ... ... A few years later, the villain princess was sitting on the throne, her body was soft, she glanced at the people behind her, pursed her lips and looked resentfully: "You just have to push your limits."