So I lost this manhwa (I think?) I was reading last year - I do not remember much except that it was:

• Extremely humorous, more like small short chapter gags with an overall story in the background
• I think the protagonist ends up summoning a demon or a monster of some kind (he did look like a monster/demon, not like a human)
• The sister saw him, or accidentally find out, I think
• I remember the protagonist also ends up working at a cafe where there is a girl working there... who is undercover. There is also another guy who accidentally thinks the protagonist is in love with him (?)

I am so sorry, there were a lot of misunderstandings and comedy, but I cannot seem to remember much.

Camelot is a silly place