As the title,
1. I am not happy with my work.
2. I am not happy in my work.
If both are correct, what's the difference between them?
Are there any more prepositions to use in this sentence?
I am not happy _____ my work.
thank you for your time and attention!
"I am not happy with my work." is correct. The adjective "happy" is mostly used with the "with" preposition, and sometimes "about" too.
"I am not happy in my work." may suggest the person doesn't like the place he works in, but I don't think any native speaker would use it.