I Can Modify System Data

When Cheng He woke up, he found himself in a world similar to a feudal dynasty. Real beasts, boundaries, blood cancer, and the martial arts that make people feel frightened after practicing. Everything tells the difference of this world. Cheng He, on the other hand, brought with him the modifier written in Yi language in his previous life. Came into this world. But I found that my modifier could only modify system (game) data. And the so-called system is exactly what Cheng He had in mind...