Namgungsega Mangnaegongja

Nangong Taishao has hit rock bottom. Penniless, homeless, and labeled as the reject of the Nangong clan, he awaits a pitiful death. That is, until some trick of fate drops him right back in his childhood. But our protagonist knows better than to repeat pointless training against his far more talented brothers. No, he has a better idea: run away from the Nangong clan and live a peaceful life! All he has to do is make sure everyone sees him as the loser he is. Shouldn't be too difficult... right?

(Source: Tapas)