After My Sister Took Away My Spirit Bones, I Became the Favorite of the Demon Clan

The emperor's father was assassinated, his fiancé was framed to die in battle, the dynasty was overthrown, and the body of the sworn sister he had rescued was cut out alive. She was forced to enter the forbidden forest alone, but was adopted as an adopted daughter by the demon king; He changed into a demon bone and became the favorite of the demon clan bosses; Three years later, he returned to his hometown, found out the truth, pointed his gun at the enemy, collected cute beasts, and killed evil spirits! The head of the number one sect in the world is actually his senior brother? Adopting a younger brother who is actually an ancient mythical beast? Baked an egg and hatched out a handsome little boy? I wanted to keep him for a while, but ended up accidentally developing a villainous boss?