Which episode did the Swallow ride with Althea in Princess Pearl?

In episode 53, the Isaiah skirt fighting with the swallows was taken to the suburbs by the sudden appearance of Ertai. They talk about fencing and horseback riding. They tell each other that each other is cute. Qi Keli told the emperor that Xu's candidate was changed to Er Tai. At E Ertai's wedding, the bridesmaid swallow made things difficult for the groom, which made the Saiya skirt very impatient.