Assassin of an Assassination Family: A Genius Assassin

There had only ever been one crime from the start for Si-en.

Weakness.

The continent's strongest knight, who built up an invincible legend; the great mage who reached the level of a demigod; the chief inquisitor called the executor of heavenly punishment...

He was strong enough to bring down the empire's greatest heroes, but not strong enough to bring down the empire itself.

The assassin's atonement begins in this way after returning once more.