It's Past Time I Took My Puppy to Wander Around the World.

He was once the sharpest knife in the imperial city, guarding the cold palace walls and even colder tactics. A well-planned palace coup pushed this extremely powerful royal guard into a dead end and became a victim of the power purge. When the golden steps were stained with blood, the only thing that broke into his world was not reinforcements, but a trembling and whimpering puppy approaching. Escape comes at a heavy price. Embracing this unexpected, fragile and warm life, he looked back at the majestic imperial city that swallowed up loyalty and glory, and crushed the token of identity into the dust. From now on, he is no longer the sword in front of the emperor, but just its (puppy's) shield. The world is far away and the pursuit is not over yet. The sharp blade in his hand is just to protect this only warmth.