Hi All, I need some advice.

I have been working my ass off for a foreign client for 2 years(2018 college passout). I'll be getting an onsite opportunity in some time for a few months. I'm planning to study masters in Germany after I come back. The main reason I want to go onsite is because the pay is good and it could cover a lot of my expenses.

Would it be unethical to go onsite, work, come back and resign immediately(with notice period)?

Any suggestions how to tackle the situation because I also need some recommendations from my work place to apply for Masters and I'm not sure if they'll give me in this situation?