In what year was the album “END THEORY” released by YOUNHA?

In what year was the album “END THEORY” released by YOUNHA?: The album “END THEORY” was released in 2021 by YOUNHA, featuring 11 tracks.
What is the most successful song from the album “END THEORY” by YOUNHA?: “Oort Cloud (오르트구름)” is the biggest hit from the album “END THEORY” by YOUNHA.

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