How long before you leave is best to ask

Because I don't like the job window period. When I start to want to change jobs, I will use my annual leave to interview. After I find it, I will negotiate the report time with the new company. The original job will be proposed to resign according to the labor base law.

I have been working for a year and a half now. According to the Labor Standards Act, I submitted my resignation 20 days ago. Of course, I did the same.

But in exchange for a 180-degree change in the malicious attitude of the company's supervisors and colleagues

I wonder if this has happened to any of you?

how to resolve it