
ML's best friend is also friends with the male asshole twin so he must have known that the female asshole twin was his sister but he doesn't tell his best friend? Female asshole twin didn't tell ML she was a twin even though male asshole twin was bothering him. Well, there's a easy explanation: she wasn't a twin until a couple chapters ago when the author pulled this storyline out of his ass.

You let yourself get manipulated by the overly aggressive EX-boyfriend and now your crush has seen you returning the loving embrace of your EX-boyfriend. Up until now, I've been a staunch supporter of Tulip, but I didn't expect her to act this dumb. I hope that P'Chen turns around and walks away. He lived up to his promise only to see you lovingly hugging someone else.
the guilty party (Yuuko) will end up being apologized to by the victim (Riku) instead of the other way round. He will also most likely be forced to apologize to the accomplice (Airia) and no one will apologize to him.