A.B.C-Z have started a project called 'History Collection' where they will be uploading past music videos onto YouTube on the first of every month. 

A.B.C-Z have been carrying out their project 'Z PROJECT' in preparation of their tenth year anniversary next year. "History Collection" is a part of this project aiming to reveal several MVs per month which have been unreleased on video sites until now. On May 1, the group have uploaded the videos for "Crush On You" and "Black Sugar," both of which were released in 2019. You can check them out below!