Seeking the name of a transmigration fantasy novel

The male lead transmigrated to become a prince. He had silver hair and purple eyes. He was very beautiful. Later on, his brother liked him too. The male lead had disputes with many men. In the end, he even had an ambiguous relationship with his son. The ending of the novel was about the River of Forgetfulness and the other shore flower. There seemed to be the word 'world'. Please give me the name of the novel.
In the beginning, the male protagonist transmigrated to become the Crown Prince. Then, the servant girl took a mirror to help him dress up. He was shocked when he saw his own appearance. She described his face as pink. There was also a plot in which the male protagonist ran to a foreign country and later disguised himself as a woman to assassinate the emperor. The overall style of the novel was very gloomy. The male protagonist had also gone to the Bridge of Helplessness to look for someone called Phoenix or something. That Phoenix or something accepted the sky burial. Later on, the Black Sovereign even fell in love with him and made a bet with him. At the end of the novel, the person crossing the river at the Bridge of Helplessness was the little one who died for him. He even talked about the philosophy of life with a pure heart and few desires. The little one was very miserable. The male protagonist had a son with a man. Later, the man died. Every time the male protagonist saw his son, it was as if he saw him. The novel especially liked the red spider lilies that filled the sky. I don't remember the name of the novel. I've been struggling for a long time. Please, God.

Answer 1

One of the novels was called Demon Lord. This was a web novel with fantasy and martial arts elements. It told the story of a modern man who traveled to ancient times and became a demon in the martial arts world. In this ancient world, men practiced martial arts and fought for power and status, and they had disputes and conflicts with each other. The novel's plot was complicated and the characters were vivid, which was loved by the readers.