Thank you Translator! I lose all hope this is being translated again but I'm glad you did it. Even if you dropped it, At least, we get to see this arc ended.
I have 2 theories -
1. Looks like that guy is gay. He might play tricks by purposely dropped the coins making the fmc thinking that he and mc slept together. I don't remember tho whether MC told him or he knew about the coin things. Might need to reread.
2. He somehow had the connection to...