I'm mad at the company leader ~ will it affect my future work?

Yes, as for the consequences, it depends on the quality of leaders you meet. But if you only go for a month, if you are not a public institution, but a general enterprise, if the salary is not very good or you have reason to stay, what does it matter to them later? Don't waste time where it's not worth it. People only have one chance to live, and time is limited.