Because Li Yuan and Yang Guang are cousins, they have been promoted and heavily armed instead of being killed. But Yang Guang's heart to kill him is always there. The camera suddenly turned to the hunting ground, and Li Yuan, who was in his fifties, was presiding over a hunting contest. The contestants were his sons: Li Jiancheng, Li Shimin and Li Yuanji. Yang Guang made an excuse to let Li Yuan enter the DPRK and wanted to behead him on charges of Luo Zhi. Li Shimin suspected him, so he visited the palace at night and accidentally revealed his whereabouts. He was rescued by Yang Jier, and their relationship developed. Since then, the two have been living together for many years.