Song Title : Fortitude(불굴) Music. 양방언 (Yang Bang Ean) String Performed by Uchu Yoshida Strings Concert Master. Uchu Yoshida Session Recorded at. LANDMARK Studio @ Tokyo, Japan Violin. 강이채 (Echae Kang) Violin Recorded at. TONE Studio @ Seoul, Korea Business Coordination . NEXTIV, INC. (Johnny Ahn, Thomas Lee)