In Guangcheng, the local wedding custom is basically to fetch the bride before noon and have the banquet in the evening. If both parties are locals, the bride is brought to the groom's home, serves tea, and then returns to her parents' home, which is considered a visit back home. In the evening, they jointly invite relatives and friends to celebrate.
As the saying goes, when in Rome, do as the Romans do. Since Ying Xiaoya is getting married in Guangcheng, the groom naturally comes to fetch the bride close to noon.
Cheng Su is the adoptive daughter of the Cheng family, so she should be part of Cheng Yaozu's team to fetch the bride. However, she is also Ying Xiaoya's best friend, and now the two are becoming sisters-in-law. Ying Xiaoya repeatedly requested and appealed, so Cheng Su joined the wedding procession.
