Xia Siyu finished her filming in the afternoon, and her part in the production was wrapped up. However, in a film crew, where it's rare to gather together for such a long time, a big group of people living and eating together, crews with good relationships usually arrange a wrap party, also known as a farewell feast. In reality, it's just an excuse to eat and drink under the guise of saying goodbye.
Although celebrities usually maintain their figures, the intensity of rushing to complete filming is so high that sometimes they can only sleep for two or three hours a day. Under such high-intensity shooting, the occasional indulgence is regarded as a "cheat meal," and most people would not refuse it.
Xia Siyu had been with their crew for more than three months, spending one month gathering materials and experiencing life, one month on location, and a little over a month on set. If you add in the time spent on pre-production, it was even longer.