After the Dragon King Wakes up [Western Fantasy]

Dragon Knight receives × dragon attack I haven't thought about the text yet, but it's probably a Western fantasy setting. The second prince of a certain country went on a trip and was trapped in a formation. After breaking away from the formation and forming a contract with an ancient frost dragon, he found that the country was destroyed, and he managed the country after it was restored. The ancient frost dragon that looked down on the world lowered its head, letting the weak human stand on its head and let him drive it. The glory of the empire was rekindled, and wherever the Dragon King passed, everyone bowed their heads. Plot flow, two places. Intention: Before the desperate situation, there is still a glimmer of light