If anyone broke the rules of the hooligans, they would be chased away and beaten up. As an outsider, Little Brother Le naturally didn't know about this rule. Therefore, he was discovered on his first day of work and was blocked in an alley. He was almost beaten up.
It was White who saw him and hid him in an alley, which saved him. After that, White told Little Brother Le about the rules. After Little Brother Le learned about the situation at their house, he began to bring food for them.
According to White's observation, those hooligans would take advantage of the time when there were many tourists during the day and night. After they got money, they would basically use it to exchange for alcohol and drugs to get drunk for the rest of the night. Therefore, they basically didn't come out in the morning.