South Korean boy band Monsta X is back with new music.

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The K-pop group released the EP Reason and a music video for the song "Beautiful Liar" on Monday.

The "Beautiful Liar" video shows the members of Monsta X take the stage in front of a crowd of mysterious people dressed in all black. The video also features imagery of chains and a horse in a red tent.

The song explores a "dangerous" but "addictive" relationship.

Reason also features the songs "Daydream," "Crescendo," "Lone Ranger," "Deny" and "It's Alright."

Reason marks Monsta X's first EP since Shape of Love, released in April.

Monsta X consists of Shownu, Minhyuk, Kihyun, Hyungwon, Joohoney and I.M. The group made its debut in 2015.