Surviving as a Genius on Borrowed Time

A brief description of the manhwa Surviving as a Genius on Borrowed Time:

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! Show more