In Shanghai in 1936, Lin Mo, a low-level gangster, was bullied for saving his seriously ill sister. He was framed by the leader, Scar, and beaten to the point of death. In a desperate situation, he awakened the spy king's growth system and gained god-level insights, photographic memory, disguise and other unnatural abilities. He killed Scar and regained his wages.
In order to revenge and survive, Lin Mo was spotted by the Japanese military's special high school, and he lurked in the Kuomintang Logistics Department under a pseudonym. He used his system to outwit corrupt officials, steal secrets, and accidentally got involved in a three-party espionage war between the military command, gangs, and the Japanese army. He gradually transformed from an ant-like dock boy to a shadow spy king. On the turbulent Shanghai beach, he single-handedly stirred up the spy sea and uncovered the truth behind the tragic death of his parents and the Japanese army's "Sakura Project" conspiracy.
