**Timeline:** Based on the actual timeline of the real football world, starting from 2004, it has experienced the rise of the Premier League, the battle between the two giants in La Liga, the revival of Serie A, as well as major events such as the World Cup and the European Cup.

**League system:** Includes the five major European leagues, including the Premier League, La Liga, Serie A, Bundesliga, and Ligue 1, as well as intercontinental competitions such as the Champions League and Europa League.

**National Team System:** Includes national team competitions such as the World Cup, European Cup, and America's Cup. Ren Xiaoyao can choose to join the Portuguese national team or the Chinese national team. (This sets the stage for the subsequent plot)

**Clubs:** Based on real-world clubs, including Manchester United, Arsenal, Chelsea, Real Madrid, Barcelona, ​​AC Milan, Juventus and other top teams.

**Stars: **Based on real-world stars, including C Ronaldo, Messi, Rooney, Henry, Ronaldinho and other legendary superstars.