[BOOK NINE] a book of horror stories compilation! pre-released: 6 April 2021 start: 21 April 2021 end: 11 Februari 2022 cast: - NCT127 - Aespa - The Boyz - Secret Number - Enhypen - Weeekly - Seventeen - StayC - Treasure - Loona - Nuest - Purple Kiss - TXT - Mamamoo - Oneus - Everglow - GOT7 - IVE - DRIPPIN - OMG - Ciipher - Rocket Punch - Onewe - GFriend - A.C.E - Woo!ah! - Golden Child - Kep1er