Can someone help me find this manhwa please?

hello everyone!
a long time ago (like years) i read this manwha about a poor girl who gets chosen/ invited to this secret club? it was three letter, like an acronym or something! i cant remember much but she had short light hair? and the manwha had a scene in which she was put into a room and told to choose the most expensive thing there, and she picked up a picture frame and it turned out to have diamonds inside it? also i think her love interest was jealous of her getting invited in the beginning? idk ! if anyone knows what I am talking about please tell me!! i would love to find out how it ended!!