1. How Are You Doing? 

서울과 파리를 배경으로 한 얼터니티브 듀오 마티아스이채(Mathias Echae)의 첫 싱글

[Credit]
• Composed, Arranged, Lyrics by Mathias Minquet, Echae Kang
• Mathias Minquet : Guitars, Bass, Vocal, Drums Programming
• Echae Kang : Vocal, Violin, Viola, Piano, Sub Guitar
• Sooyoun Lim : Cello
• Johnny (NYB) : Marketing Agency
• Recorded by Mathias minquet, Echae Kang
• Mix & Mastered by Hyomin Kang (Brickwall Sound Studio)