2 'GUILTY') is the fourth extended play and the second part of The Clan series by the South Korean boy group Monsta X.

[1] The music video for the title track was released on Starship's and 1theK's official YouTube channels on the same day, directed by the award-winning film director Dee Shin.

The EP contains the story of protecting their innocence against the world that has caused them loss and pain.

[3] "Fighter" is a song that captures the ears of listeners by expressing explosive youth, particularly, the overwhelming punchline, romantic melody, and direct lyrics intersect without rest, creating a dynamic feeling in the music and performance.

[5] The title track "Fighter" debuted at number eight on the Billboard World Digital Song Sales chart upon its release and the song "Be Quiet" debuted at number fourteen in 2021.