In reality, Lin Huang wanted to collaborate with the Union Government for many reasons.
One of the main reasons was to prevent Huang Tianfu and the rest from falling back into an underground organization after he left the gravel world. It would mean that his efforts were wasted if that happened.
Collaborating with the Union Government publicly would tie Dynasty and the union organization together. By the time he left, Dynasty would only have two options. One was to merge with the union organization while the other was to remain as a neutral organization. Meanwhile, the option of rejoining the underground organization would be out of the picture completely.
Naturally, there would be clear disadvantages to doing that.
Within a short period of time, Dynasty would be a traitor to all the underground organizations. Some of them might even go after Dynasty for revenge.
Nonetheless, Lin Huang was prepared to handle that.