"Chaotianmen". According to the query on the QQ Music app, the lyrics "from a to z" come from gai's song "Chaotianmen", which is included in the album "China Rap Peak Showdown Issue 9". Excerpt from the lyrics: "Get ready, wait until you get anxious, I'm going from A to Z, I'm so handsome, I got it, I played the game, I got into the VIP directly."