Traveling across a deserted island, while others were leveling up, I was practicing "Gou". After maxing out the stealth and swallowing skills, I discovered that the true use of invincibility is to prevent the whole world from discovering that I secretly saved the world. This is a story about how a "coward" used the most special way to become the strongest guardian of the world. I hope it can bring a relaxing and enjoyable reading experience to every reader, and that after laughing, they can feel the warmth of growth, responsibility and inner peace.