Il Suocero è un Maestro Nascosto

The mighty Shaw family is disgraced when their proud heirs are crushed in the Nightmount Clan tournament—cowards who kneel and beg. But no one expected their most humiliated outcast, the "worthless" son-in-law Jasper Swayne, to step forward… and unleash terrifying power! Who is he really? The Shaw family’s survival now rests in the hands of the man they despised most!