How do I complete Billy's promotion event, 'A Hairstyle's Importance'? September 26, 2025 07:22 Updated With Billy as the team leader, enter the Hollow Zero.Explore the area and trigger specific events within the hollow to complete the commission. Related articles Why can't I get the TreCarls Film Case for Lucy's trust commission? Why is my game progress missing on Xbox, and how do I link the correct account? Minimum device requirements for Zenless Zone Zero How do I find or trigger the 'Behind the Curtain' quest? Why am I getting an error message that my redemption code is invalid or has already been used?