Martial Arts

Jung Yeonshin was born with a short fate: being unable to live past the age of twenty. Although everyone in his family looked down on him, his skills were remarkable enough for him to create his own martial arts. One day, Yeonshin realized that he doesn't have much time left to live... This is where Jung Yeonshin, a terminally-ill genius, begins his desperate struggle to survive
SO FAR SO GOOD, LOVING THE MC

Yong Hwarin, debilitated by illness and weakness as the heir to the Tianzhong clan, ultimately gave up the path of martial arts and lived as a merchant after marrying into another family.
Carrying his regrets until the time he met his end, he unexpectedly travels back to the past he thought he would never revisit…!
Returning to the time of his lowest point, he swears to his shattered heart that his fate will be reborn through his own hands.
Really cool and MC is very handsome

Woosung, a man who once roamed the murim relying solely on his fists, met his sudden end at the hands of the demonic faction.
He then finds himself in the body of the eldest son of an affluent merchant group named Eunha.
Though his new body offered only wealth, Dan Woosung rises again, backed with vast riches and the martial prowess of his previous life. Now, he returns to the path of vengeance.
LOVING IT, THE MC IS SO COOL