In the old days of Shanghai, a chaotic era where various factions vied for power and intrigue abounded, a mysterious group of thirteen individuals with exceptional martial arts skills emerged as key players known as the "Thirteen Guardians." Despite their renown, their true identities remained shrouded in secrecy. In the year 1935, amidst the shock and unrest following the signing of the humiliating "Shanghai Ceasefire Agreement" with Japan by the Nationalist government, the renowned Gu Mingjue issued a call to arms through a widespread "Loyalty and Righteousness Edict," summoning heroes from across the land. Little did they know, the path ahead would not be as smooth as they had hoped...