My Brother Became the Son of Destiny, and I Became the Big Devil.

System + two male protagonists + fantasy + time travel + the second male protagonist is decisive in killing + the first male protagonist has a mother's heart overflowing The two people who became sworn sworn friends at Blue Star both traveled through the world of immortality. He passed through the body of a disciple with mediocre talent. His brother was reborn as a superpower and became a prince. After having limited talents, he did whatever it took to increase his strength and became a big devil who was full of evil. The brothers' luck went against heaven's will and they did good deeds and accumulated virtues to become the most good people in the world. He has a system that can rival the Son of Destiny. Also known as "You have an ancestor, I have an ancestor"