In what year was the album “Hors Série Vol.1” released by 4Keus?

In what year was the album “Hors Série Vol.1” released by 4Keus?: The album “Hors Série Vol.1” was released in 2017 by 4Keus, featuring 14 tracks.
What is the most successful song from the album “Hors Série Vol.1” by 4Keus?: “O'KCLH” is the biggest hit from the album “Hors Série Vol.1” by 4Keus.

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