cossoff's first single ablum '20XX' has been released in April 2020.

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1. 20몇쯤 나에게 (To Myself In 2019)

2. 넌 날 사랑하지 않았잖아 (U didn’t love me)

3. 원래 그랬던듯이 (Dejavu)

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Produced and mixed by cossoff

Mastered by 신재민 at Philos Planet

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Available in every music streaming services