Ask for the name of a fantasy novel

He only remembered a little of the plot. The main character seemed to have gone through a test and then encountered the door of life and death. In the end, he hit the door of death. Then, the guard said that the only person who could come out alive after hitting the door of death was…Alright, I don't remember the exact number. Then, the protagonist picked up the relic of the person who had entered before. At first, it was very difficult to pass the level inside. After a while, he picked up other things. Then, the protagonist successfully passed the level and was able to bring the castle to the real world. Then, the protagonist seemed to have the surname Yuan. Then, the protagonist went to another time and space and met a monarch... Ask for the title