(04/08/21)

-난 그것을 어떻게 고치는지 알아. I know how to fix it. ​

-난 커피를 좀 마시고 싶어. I want to drink some coffee. -> I want some coffee. 

=> Your sentence has a correct grammatical structure, but this has the correct usage/ expression.

-난 사장님 옆에 앉고 싶지 않아. I don't want to sit next to my boss. ​​