Chronicles of the Phantom Knight

This world is becoming more and more terrifying! Some people choose to work hard to save it, while some people choose to sink into it! The young knight with a dragon living in his heart obeyed the agreement he made with the Son of God. In the winter of the year when he was seventeen, he stepped out of the mountains, walked out of his home in the mountains, and came to the historical stage of this world. What changes will his appearance bring to this world?