DIA (다이아) KOREAN DIA – The Trainee (연습생) 연습생 yeonseupsaeng “The Trainee” [EP] Happy Ending 2016.06.14 Eunice, Huihyun, Jenny, Chaeyeon, Eunjin, Yebin, Eunchae Lyrics/작사: DIA Members Composer/작곡: 안영민…