Man Up! This Skinny Guy Wants to Become a Muscleman

[Easy + cool writing + high martial arts + time travel + system + unlimited heavens]

Luo Tie, who was originally a muscular man, once traveled through time and became a skinny man who was abandoned by his adoptive parents.

Thin dogs, skeleton soldiers, hexagonal boards, cornstalks, stick insects... Are all his most standard portrayals.

So,

Even if demons and ghosts are running rampant, spiritual masters are fighting, and the world is overturned.

Nothing could stop Luo Tie's... Obsession with muscles.