Otto's signature can only be issued in the 1 1 level of story mode and Taylor's "Otto Heroes List-Beyond Otto Brothers" level, just press the R 1 key. The first generation of Zuo Fei, Severn, Jack and Ace, don't forget to press R 1 to send Otto's signature in the battle with the tyrant. If Zuo Fei forgets to send it, the first generation will be hit by a tyrant at the beginning of the second round and will lose 50% of its blood. A generation doesn't send Saiwen, Saiwen doesn't send Jack, and Jack doesn't send Ace, so he plays. This will be a vicious circle.