What's the Point of Dressing up as a Deposed Prince and Having a Cat and a Dog by His Side to Become the King?

Dressed as a useless prince, only one person and two friends are left by his side. The cat turned into a treasure, cold and arrogant, and never left a living person under his claws; the dog turned into a general, loyal and brave, and dared to block a knife with his chest. The system pops up and says that the host's combat effectiveness is not as good as that of a dog - then let the dog be the marshal and the cat be the assassin. Starting from the ruined temple, he fought his way through the capital and reached the Golden Palace.