Lee Jinsook is a curious girl. She knows everything: which kind of book Sojung read when she's sad, the way Cheng Xiao frowns her forehead when she can't understand a korean word but pretends she does, how Jiyeon likes to fold her own clothes when she's nervous, and the many ways Dayoung likes to when she isn't well, because her fellow maknae always knows which buttons to push. She knows everything, until she doesn't.