Labeled a Loser: Awakened Saint Soul, Killed Everyone, Family Begs in Tears!

[Starting with the word "kill," a super genius, invincible, ruthless, a system-driven army maker] Chen Fei transmigrated to a fantasy world. Here, his father was the head of the Lin family in Demon Sea City, and his mother was the eldest princess of the ancient Zhuge family! He thought it was a perfect start, but he was wrong. Another piece of old-fashioned trash? His predecessor's potential talent was only the weakest Yellow-rank Martial Soul, a world apart from the Heaven-rank Martial Soul possessed by his twin brothers! One brother was a super genius, the other a piece of trash. The difference in their abilities was obvious. His parents disliked and favored him. His siblings beat and tormented him. Everyone fawned over his twin brother, praising him highly, while everyone else scorned and despised him, the trash, even imprisoning and tormenting him for fear of disgracing them. Such a life was like purgatory, so aggrieved, so heartbreaking! Fortunately, the system didn't let him down. Chen Fei angrily cursed his biased, beastly parents! He severed ties, disowning all his relatives, and awakened the Heavenly Reward System! He frantically amassed troops, growing stronger through cultivation. "Ding, congratulations, host, you have obtained a Saint-level Martial Soul—Demon King Whale!" "Ding, congratulations, host, you have revived your Saint-level Martial Soul—Phoenix Divine Sword!" So I was the real genius? So my Martial Soul power was stolen? A raging fire ignited within him, and Chen Fei became a demon in an instant! He disowned all his relatives, slaughtering his biased parents! He plundered Martial Souls, becoming the most terrifying demon king in the world! I will disown all my relatives, showing no mercy!