So brutally honest about how horrible they bake :/ At least say something like "I sell delicious cake" so it sounds convincing haha. I understand that this is in negative form because it's spelled differently.
It's actually a verbal modifier in this case. It turns a verb stem into an adjective
This is a tricky one.
There are 2 types of ㄴ suffix: 1. 은/는 topic particle just like you said, 은 after consonant, 는 after vowel.
- ㄴ/는 adjective modifier. ㄴ after vowel and word with ending ㄹ, 는 after consonant. 길-긴, 있는, 없는