I dont understand this. He washes cars and can barely afford to eat. There's NO WAY he could have GOOD stamina. There's a lot of things wrong that you can look past in this webtoon, but man is this bothering me. A proper diet and exercise should be established before he should get ANY stamina. Ace the diamond covers this well and I feel like this just treated his whole backstory of being poor, weak, and unable to fight as if it didn't happen.