you had a brother named wonwoo, and he had a girl best friend, bada. she helps him with doing choreography, so she was a really big help to your brother. and your brother had a girlfriend, so he wasn't interested in bada romantically, he only sees her as a friend and nothing more. bada doesn't have a boyfriend, she was mostly interested in girls. wonwoo invited bada over to your house, after their practice to eat lunch. wonwoo also invited his girlfriend over, to spend time with her.