Leaving for Dingxiang

what happens

All the tribes form an alliance with Tang. Li Shi Min persuades Chang Ge to stay in Chang'an, but she decided to leave for Dingxiang to rescue Ashina Sun. Before she leaves, she visits her mother's memorial hall to ask for blessing. She finds the proposal letter written by Ashina Sun. On the other hand, Ashina Sun who is kept in prison by Yicheng agrees to gather the Eagle Army and fight for her on two conditions.