Ni Zai Dong Wo Yixia Shishi!

Special Ops 500 accidentally teleported to a RPG world, he has to defeat all 8 demon kings to break the curse of the goddess and go back home. Unfortunately, the main character got a bug with his system and only has 1 damage and 99999 defense, he does everything he can to get rid of his curse and does everything to go back home and decides to break through every obstacle he comes across.

(Source: Kuaikan Manhua, translated)