Piece of a Puzzle (Completed)

When Bang Y/n moves to Seoul to live with her older brother after an incident back home in Australia, she didn't expect to befriend the sunshine twins. She also didn't expect to fall for them as well, knowing they were already in an established relationship. What happens when after a while of being friends with them, she writes notes to the anonymously telling them that she loves them and puts them in their lockers. What happens when she starts to get notes back?