War has destroyed the world, so Ling Zihan has many choices for how to move his lower body: spider style, crawler style, chain style... For internal organs, he can have more choices: multiple lungs, more than two hearts, multiple arms, Duowei... The basic method of human beings' powerful method is semi-mechanical transformation, and the powerful method of biological people is evolution. Ling Zihan is between semi-mechanical and semi-biological. Between iron and blood, a choice must be made.