The reign of Wu Zetian was a terrible period for ministers in the Tang Dynasty, in order to keep their power. Wu Zetian killed many ministers and relatives of the DPRK. He used a bunch of cruel officials such as Lai Junchen and Luo Zhi to purge his political opponents. This gave a signal to Wu Sansi, the nephew of Wu Zetian, that Wu Sansi was confident that he could become the heir of the Tang Dynasty. One person he must get rid of is Li Dan. So he formed a political alliance with Lai Junchen, which led to some charges of rebellion and wanted to get rid of Li Dan.
Just when Wu Sansi and Lai Junchen thought they were going to succeed. Amgen went into hiding, and he proved Li Dan's innocence with his own life. I bought Li Dan a lot of time to prove his innocence. Later, Wu Zetian ordered a thorough investigation of the matter and found that Li Dan was indeed wronged. Li Dan finally recovered his life, and the person he needs to thank most is the villain An Jin Tibet.
Li Dan is a man who keeps a low profile. He once won the throne of the Tang Dynasty three times, but he knew in his heart that as long as Wu Zetian was still alive. He can't sit in this seat safely. If he can't sit in this position safely, he might as well not do it. After the death of Wu Zetian, Li Dan successfully became the son of heaven.