In what year was the album “COSMO” released by PENTAGON?

In what year was the album “COSMO” released by PENTAGON?: The album “COSMO” was released in 2019 by PENTAGON, featuring 3 tracks.
What is the most successful song from the album “COSMO” by PENTAGON?: “COSMO” is the biggest hit from the album “COSMO” by PENTAGON.

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