Guarding the Beauty Princess

Jin Yi's hands were stained with blood, and for a long time, he was just a killing machine. Later, the machine betrayed and destroyed the controller. He originally wanted to put down the butcher's knife, but the old monk told him that besides killing and cutting vegetables, the butcher's knife can also protect justice. Even if one kills someone, there is a very just excuse called punishing evil and promoting good! So he decided to protect something to atone for his sins, and hero saving might be a good idea. However, there was a deviation in the development of the story. At the beginning, many knights guarded a princess, but in the end, he was the only knight left, while there were many princesses