The Slap King Returns

High school senior Ethan Kingsley is labeled an "F-Class" nobody, the absolute lowest tier. Constantly subjected to intense bullying, public humiliation, and cruel mockery from elite classmates like C-Class Leo and Tony, Ethan bears it all patiently. However, Ethan harbors a monumental secret: a dark-gold sigil on his hand, inherited through his dormant bloodline, which awakens on his eighteenth birthday, granting him legendary, immeasurable S-class power.