Getting on and off in jiaozi is a blessing of China folk tradition to guests. Jiaozi stands for reunion. When the guests are ready to get on the bus and leave, inviting them to eat jiaozi means sending blessings to their trip, wishing them a pleasant journey and looking forward to being reunited with their families. Noodles represent the long-term, and eating noodles when welcoming guests is to hope that their feelings will last for a long time.
Getting on and off at jiaozi is a traditional custom in northern China. People are used to eating jiaozi for those who are about to travel far away, and noodles for those who come from far away or come home from far away. There are some customs similar to "getting on the bus and getting off the bus". For example, in ancient times, the scene of sending troops to fight was "handing in the children and dismounting", and when the host family saw them off, it was "handing in the children to see them off and welcome them".