Base on MAESTRO:

A world full of music, music is the number one priority in this alternative universe. There are MAESTROs' that lead this city, full of magics and musics. MAESTROs are considered as the most powerful and popular in this city, they help people and make this city live by musics. Maestros' are the most respected group, but their leader remains mystery; compare to the other members, the public never knew the leader's identity. However, there are FAKE Maestros that wants to replace them. The FAKE Maestros uses AI or Robots, they tried to copy the REAL Maestros' musics but it only comes out with an glitch or error so they decided to destroy them.

REAL Maestros: Yoon Jeonghan Jeon Wonwoo Lee Jihoon Seo Myungho Boo Seungkwan Their Leader: Kwon Soonyoung

FAKE Maestros: Choi Seungcheol Hong Jisoo Moon Junhee Lee Seokmin Chwe Hansol Lee Chan Their Leader: Kim Mingyu