Title of this manhwa

The fl which her hair is quite of dark purple and short and the mls hair is brownish blond?? and the fl somehow went to a school which only rich people are attending since she was smart enough to go and she has like 2 jewelry which her and her sis had to communicate but somehow the sister lost it and and the ml somehow found it and used it which is an earring and the ml is quite popular but is dumb as fuck to know what kind of atmosphere around when hes w people but the fl came to help with that. They met eachother when the fl was trying to sneak to the mls party house and hid in the pool?