The Starman who was picked up by Superman at the beginning

My name is Li Zhen. An outstanding graduate of Vitrum and a traitor of Vitrum. This civilization is so cruel, so cruel that I can’t help but miss the peaceful days on earth in my previous life. For this reason, I made a major decision on the day of my coming-of-age ceremony. Taking advantage of the moment when the other Vitrum reservists were relaxing after conquering a planet. He grabbed a spaceship from the dilapidated and unlucky planet and planned to go to the earth and have a leisurely time. Even if it is liquidated by Vitrum Star afterwards. But when I finally arrived near the earth after all the hard work, a guy I never expected appeared. Why is there a superman on this earth? !