YU Gwan-sun is imprisoned during Japanese colonial control for starting the March 1 Movement. YU rallies her fellow prisoners against Japan. The Japanese security head feels resistance and tortures a convict to find out who's behind it. Gwan-sun pretends to obey the Japanese while planning another independence rally. The action spreads to the streets, and YU is tortured again. She dies two days before her release, but her spirit is freer than ever.