Does the subject want to ask "how to cross the fire line 1 1 month Hu Ling appointed mailbox"? Fill in the player's QQ mailbox directly. Crossing the line of fire is a first-person shooter game developed by SmileGate in Korea and operated by Tencent Computer System Co., Ltd. in Shenzhen. 1 1 Hu Ling's appointed email address in this game can be directly filled in the player's QQ email address, but remember to add a suffix when filling in the email address. The QQ e-mail address is qq.com.