BEFORE HE WAS THE MASK, TSUI WAS PART OF THE 701 SQUAD, ANELITE MILITARY FORCE OF MEDICALLY ENCHANCED SUPER-SOLDIERS WHOWER RENDERED VOID OF PHYSICAL AND EMOTIONAL PAIN. DEMORALIZED,TSUI ESCAPES FROM THEIR HEADQUARTERS IN MANILAND CHINA ANDATTEMPTS TO LIVE A NORMAL LIFE IN HONG KONG.