Ilbosingwon

Born as the son of a wealthy family, Jang Geon was destined for ruin. To turn his fate around, he had to live a simple life under the guidance of a virtuous monk. Given to the frugal monk Gyeongmok at Shaolin Temple, Jang Geon spent his days in rough cotton robes, barely getting by on plain rice... While enduring hunger and minimizing movement in his daily life, he stumbled upon martial arts and managed to apply his mindset of thrift to it...?

(Source: KakaoPage, translated)