Guanlong Group was first established by Yu Wentai and divided into six pillar countries and twelve generals. Its internal members are basically local tycoons, armed to the teeth, and sometimes don't even care about the emperor. For example, when Emperor Wendi of Sui Dynasty seized the throne, he needed the support of the nobles in Guanlong, and constantly wooed the ministers in the DPRK to prepare for his own seizure of the throne. This explains a problem, the influence of Guanlong nobles on the royal family. If you want to be emperor, you have to please these groups.
During the Sui Dynasty, militarism prevailed in Yang Di, and many measures harmed the interests of Guanlong aristocratic group. Thus, there was the Yang Xuangan Rebellion. Yang Xuangan is the son of Su Yang, the founding father of Sui Dynasty, and also a serious Hongnongyang. When he saw a series of actions after Yang Di came to power, he was so angry that he didn't resist. Although part of Yang Xuangan betrayed his father, a large part of it was a great harm to the interests of Guanlong Group. Immediately after he started his army, many people responded, and even the famous Shi Biao came to take refuge in him. Shi Mi is also a member of Guanlong Group, and his great-grandfather was Li Mi, a famous Western Wei Dynasty star.
Although Yang Xuangan failed in the mutiny, what he did dealt a fatal blow to the Sui Dynasty. Later, many important members of Guanlong Group also defected, because in their minds, the leadership of their group was no longer suitable for being an emperor, and they had to choose other talents in the group. So people like Shi Biao and Li Yuan rebelled.