I worked in the ceiling shop, did not sign the contract, resigned verbally, the boss agreed, but ded

Yes! As long as you can prove that you work there and have not settled your work, you can file a complaint with the Labor Bureau and ask the employer to pay you according to the regulations.

As long as he is willing to give you these 15 days' wages, then I think it is more reasonable.

There must be a handover of work, which is from a professional ethics point of view, and legally speaking, you can just leave after saying hello.

You go to the theory with the leader, secretly record it while theorizing, keep it as evidence, and then go to the labor bureau to sue him.

The small restaurant doesn't sign a contract very much, but you have to talk to him in advance about the treatment, you don't say you don't do it, take two days off to go home to do something to use money, he doesn't give you just where to do it, pestering every day, so long until he gives money.