Initially, Han Xiao turned to Stardragon to seek temporary asylum from the Germinal Organization and had the motive of advancing skills. He had long planned to use his Facial Simulator as a way to escape.
Once he had the Facial Simulator, it was almost impossible for the Germinal Organization to locate him. He no longer had to worry about being discovered and captured, which meant that he could go anywhere he wanted. He did not want to be restricted to an area where there was always a risk of angering the head of state. Furthermore, he could mislead the Germinal Organization with regards to his whereabouts. For them to focus all their attention on Stardragon… that was definitely not fun for Han Xiao! Definitely not!