Which episode is princess huanzhu flying to protect the knife for the emperor?

In the 45th episode, everyone said goodbye to Xiao Jian and talked about him on the road. There was a sudden change in the yard at night. It turned out to be a child who stole things. Knowing that the child was treating his grandfather with money, Wei Zi and others helped him open a Yangchun noodle restaurant, and Grandpa wrote a plaque himself. The local good-hearted people held a flower pole climbing competition, and the four guards tried their hand and gave the rice to the villagers. The fire festival in Qijiang Town, everyone broke up intentionally or unintentionally. Suddenly, the White Lotus Christians assassinated the emperor, Wei Zi gave her life to protect her, and the dagger went into her chest.