It was announced last May 26, that the Red Velvet members’ Irene and Seulgi will debut as a duo with their first mini-album, “MONSTER” on the 15th of June. While fans are expecting to witness the first sub-unit of the girl group, they need to calm down for a bit as the agency revealed that there are reasons for the movement of the set date. Here is the official statement of SM Entertainment. Read about it at KPopStarz