[New Content]
1. Addition of a background music feature in the Settings.

[Optimizations and Adjustments]
1. Optimization of button display on the Underboss interface when a player has not joined a Faction.
2. Optimization of certain Super Weapons-related buffs in the Underboss Statistics.

[Fixed Content]
1. Correction of the buff "Reduces Enemy Assault HP" not displaying in the Battle Report for Cops or Oil Thieves Counterattack.