An orphan girl came to Shanghai alone in search of her younger brother who had been separated since childhood. For the sake of others, she had no choice but to step into the world of prostitution and became a singer in the "Big World" dance hall. She started a life-or-death relationship with the boss of Shanghai. After unsuccessfully searching for her younger brother, she accidentally learned that the man who had always loved her was her younger brother. For her younger brother, she concealed his life experience and protected him everywhere, even at the expense of herself to protect her younger brother. She ended up...