The Immortal of the Martial Arts World

Song An wanted to live, but he was born into a world where he could cosplay animals with a hemp rope around his neck. Martial arts is supreme and strength is respected. When Song An called out the Guanwu Illustrated Book, preparing to record the world's martial arts, and when he reached the pinnacle of martial arts, he discovered that there was a 'method of becoming an immortal' in the world...