You're Invincible, Disciple. Go Make Trouble for Your Seven Sisters

[Invincible power fantasy + gorgeous older sisters + showing off and humiliating rivals + fiery action] Ten years ago, an assassin sent him plunging into an endless abyss. By sheer luck, he survived and met nine peerless masters. Ten years later, he returns to the city, only to find himself invincible in the world! “Want to compare strength with me? I’m at the peak of the Martial God realm. One look from me is enough to scare the courage out of my enemies!” “Want to compare wealth with me? I can handcraft a one-nanometer lithography machine. The whole world is lining up to give me money!” “Want to compare medical skills with me? I can cure any difficult or incurable disease. Even the villains beg me to treat them!” “Want to compare beauties with me? My seven older sisters are peerlessly beautiful, doting on their little brother, and immensely accomplished!” “Dare to upset my seven sisters? I’ll crush your dog heads! (Literally.)”