Standard Mixtape Vol.1 Standard A Standard B Standard C Standard D Everything Standard F Standard G Standard H Standard I Piano by Jeon Sang-min - Track 1,2,3,4,5 Piano by Shim Kyu-min - Track 6,7,8,9 Guitar by Lee Pu-reum - Track 4,5 Drum by Hwang Jung-kwan Mixed at Delight Sound Mixed & Mastered by Kim Ji-Yeop Art Direction & Design by Jo Su-Min