Canglan City (a city on the east coast where football development is uneven, with both the top professional team "Canglan FC" and the bottom team on the verge of disbandment, and the football atmosphere is polarized); fictional history: no real football league connection, the domestic football league is divided into Class C (amateur and semi-professional), Class B, Class A, and Super Four, the winner of the play-offs can be upgraded. There are loopholes in the supervision of the Football Association and serious capital penetration; VR neurofeedback training is an emerging technology that only a few teams and capital groups have access to. The AI analysis system has not yet been fully popularized, but has been used by capital for gray transactions.