Collect intelligence and weapons and beat the big boss with your teammates.
Obtained through gifts from friends or comrades.
In a specific place in the game, if you find a signal gun with special signs, including clothes nicknamed the red line fairy, you will be rewarded.
Please note that the above information is for reference only, and the specific operation may change due to the game version or update. If you encounter problems in actual operation, it is recommended to consult the game customer service or the player community of related forums.