In the autumn of 1938, the Japanese army launched an indiscriminate bombing of Chongqing. The entire city was shrouded in gunpowder smoke and fear. It also became a "fog battlefield" for intelligence exchanges between the Kuomintang and the Communist Party, the Japanese special education program, and the Wang Puppet regime. Su Qingyan, who was once a top student at the Conservatory of Music, accidentally discovered that she could remember various sounds and accurately imitate various sounds after her family was killed in a bombing.
