Supernatural Power
think i read this before as a manga... i think it had the same name as well, if i remember correctly it was on Manganello, or was it Mangtune? or mangapanda??? Warning Possible SPOILERS: idk but i have read thibefore, i think he was fat there was a woman who helped him and he tried to repay her, his system used his fat to remake his body to be slim...
pls dont make the MC as a dick head person just because he can become stronger faster, it really is a disappointment that a good novel becomes a disgusting piece after the MC turns out to be a Man that can only think through his dick and force women so that he can provide protection to them in exchange of their body. Dude it's not cool to think that just because the setting is in the apocalyptic time, raping women became a norm because no matter what time or situation it was, raping women is a disgusting thing specially if you didn't even have any great ability if you didn't have a fcking cheat system