The song is "Daddy Issues" by Neighborhood
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Just a random hour edit cause I've been reading this comic. I AM NOT GOING TO TELL WHAT COMIC THIS IS CAUSE YOU SHOULDN'T READ THIS KOREAN COMIC SERIES. IT IS SUPER MESSED UP, TRUST ME.
Also for those who have read it, I don't ship Sangwoo with Yoonbum. I ship Sangwoo with jail cell and Yoonbum with millions of good comforting hugs.