You could try looking on Amazon Prime Video. They sometimes have English-dubbed versions of anime shows like Clannad After Story. Another option is to search on specialized anime streaming websites, but be careful as some might not be legal or have good quality.
The plot of the 16th episode of the second season of the year of celebration revolved around Fan Xian's return with the diplomatic mission. The Second Prince threatened Fan Xian with the safety of Fei Jie, Fan Sizhe, and the Teng family's orphan in an attempt to force him to lower his head to him. Fan Xian faced the Baoyue Brothel maze and the spring examinations crisis. These were all traps set by the Second Prince. In addition, Fan Xian also took over the palace treasury. He discovered that the palace treasury was heavily in debt, so he decided to rely on his own power to resolve the palace treasury crisis. Fan Xian and Lin Wan 'er held a grand wedding, but then the Qing Emperor suffered three assassination attempts. Fan Xian's rescue resulted in his martial arts being completely crippled.
In the second episode of the second season, Fan Xian came to the Eastern Palace to meet the Crown Prince and tell him about the Second Prince and Eldest Princess smuggling in Northern Qi. Fan Xian said that if he wanted to find evidence, he had to go to a place called Shijia Town.
The plot of the 33rd episode of the second season of the year was that after Fan Xian's injuries gradually improved, he decided to leave Jingdou and go to Jiangnan. He took Li Chengping all the way south. Some people came to find Fan Xian on a small boat.
In the 23rd episode of the second season of the celebration, Fan Xian and Wang Qinian came to pick up Lin Dabao. Lin Dabao hugged the dried hawthorn that Lin Ruofu had dried for him and kept muttering," Dad is an exception." Lin Ruofu didn't tell Lin Dabao about retiring and returning to his hometown. He wanted him to live a carefree life. Lin Ruofu looked at Lin Dabao's back as he left, and his heart was filled with mixed feelings.