Which episode is the swallow that the old princess Zhu Huan was slapped by the emperor?

In the third episode of the second part, the palace is full of drums and music, opening the palace door and welcoming Ali, Zhuo and their daughters who have traveled all the way back to Xinjiang with incense. On the grand stage of the palace, Han Xiang also dedicated a unique Hui dance to Gan Long, but Gan Long fell in love with the charm of Han Xiang at first sight. The swallow dares to contradict the king of a country because he can't bear to see his princess fall out of favor. In a rage, he slapped the swallow.