Is Causality Manhwa Based On A Novel?

Adrian died with fury in his heart, hating the tragic ending of his favorite novel. The villain deserved better. But the story was never written for happy endings. Betrayed by everyone he trusted, feared by the entire world, and ultimately destroyed by the plot itself—Cassian Nyx, the infamous Demon Lord, was never meant to be saved. Until Adrian woke up inside the story. He didn't reincarnate as a harmless bystander. He woke up as Prince Elian Ashford—the tyrannical prince destined to destroy Cassian. Worse, a cold, ruthless World System instantly locks onto his soul, forcing him to keep the original tragedy on its "correct" path. [MISSION: MAINTAIN STORY STABILITY] Failure Penalty: Immediate Death. Trapped between a lethal penalty and his own morals, Adrian chooses a dangerous path: pretend to follow the plot while secretly rewriting the villain's destiny. But there’s only one problem. The more Adrian tries to save the villain, the more the dangerous, obsessive Demon Lord begins to love him. Cassian Nyx is a monster feared by the entire kingdom. He trusts no one. Until Adrian. For the first time in centuries, the scarred Demon Lord begins to hope for a future where someone finally stays. Now, the original hero has arrived, and the System is forcing the final execution. Every choice Adrian makes pushes the world further into chaotic plot deviation. Adrian must make his final choice. Will he obey the System to save his own life? Or will he destroy the entire story itself just to save his villain? Genre: BL Fantasy Romance / Transmigration Tropes: Obsessive Demon Lord ML × Reincarnated Prince MC, Saving the Obsessive Demon Lord / Destroying the Plot for You, System Missions, Enemies to Lovers, Slow Burn, Angst with Comfort, Soul Bond.

Damien had hunted down a rare white fox. "Skin it. Have the pelt made into a fur cloak and sent to Heidi." He tossed the dead fox to one of his men as he gave the order. The man nodded, but stole a glance at me. Only then did Damien seem to remember that I was the one he was engaged to. "Take what's left and make a hand warmer out of it. Give that to Lucienne." The whole pelt went to Heidi. The scraps from the belly came to me. Later, I became Damien's Luna. When vampires invaded our territory, I threw myself in front of a wolfsbane arrow meant for him. Damien held my hand and asked if I had any last words. I looked past him, at Heidi, draped in that white fox cloak, dazzling. I pushed his hand away. And I died. When I opened my eyes again, I was back at the Full Moon Gala. The Luna had moonstones brought out. She smiled. "Whoever has the purest bloodline becomes Damien's betrothed." I ran my fingers over the moonstone and lowered my head. A faint, dim light flickered across its surface.

Luca Graven, an orphan cursed by poverty, worked under the man loathed the most— Dante Solis. He was a wealthy, powerful mafia leader who had the strongest men, including Luca himself cowering in fear. Unfortunately, Dante took a liking to him. He brought him into his home, enslaved him, treated him like rubbish….but, he never hurt him beyond his limits. Maybe that was why Luca never fully hated him, and maybe, just maybe, that was why he wanted him. Until, a new version of him shows up. He looked exactly like Dante, same voice even, but completely different personalities. This version listened, cared for him, no longer saw him as a mere slave, he nurtured him and treated him like he meant something for once. Of course to Luca, Dante had miraculously grown a heart but that person that showed him kindness and mercy wasn’t Dante. It was Allen Pierce—his doppelganger. Now torn between two different people, yet drawn to each of them and their different souls, he has to make a decision. But they don’t make it easy. Luca wasn’t the only one fighting to choose, they were both fighting to be chosen.

"Bitch! Still trying to play innocent?" Jasper said as he tightened his grip on Renea's throat and squeezed harder. Then he used his other hand and took out the phone from his suit pocket and played the video of two people having sex in front of Renea... What was even more shocking was that the woman in the video was Renea Morris, but the man in the video was not Jasper. Renea struggled to get the phone out of Jasper's hand and tried to explain, "Jasper, it was not what you think... I... I can..." Jasper looked at Renea with disgusted eyes as he said, "Let's call off the wedding. I can't marry a woman like you." After saying that, Jasper walked out of the store. Renea runs after Jasper. But then she sees Jasper passionately kissing her sister Kailey. And she hears everything, that her sleeping with strange men was all a plan of the Vipers for the last two days, and that their goal was to get out of this stupid marriage. Even her adoptive parents were involved in this... They are all doing this to her because of the inheritance left by her grandfather... Renea's heart was filled with anger and she wanted to expose them to the public... But before she could do anything, Kailey had pushed her in front of the car and she was killed... But when Renea opened her eyes, she found herself in the car with Kailey... She realized that she was reborn and went back to the time when it all started... Renea looked at the people who had hurt her in her previous life and her lips curled into a cold smile... She was back... But this time... she was back for revenge...

I woke up inside a novel, and not even as an important character. I became a pretty background extra in a smut novel. My brother, however, was the only normal person in the entire story. His character setting was the one man the soft, delicate heroine could never win over. He was the cold, unattainable Prince Charming she could never conquer. When the heroine cried and confessed her love, he was studying. When she offered him her whole heart and body, he was busy starting a company. When she spiraled into scandals and nightlife, he was already a billionaire, calm and untouchable. I thought he would live a quiet, ascetic life forever. Until one night, I walked in on him at midnight… holding a piece of clothing I recognized all too well, murmuring a name over and over, a name so familiar that my scalp tingled.

My friend and I transmigrated into a melodramatic novel about a wealthy family. When the mission ended, I chose to leave. He fell for the obsessive female lead and chose to stay with her. Eight years later, the system told me that she had locked him in a mental hospital, and he had only three days left to live. When I rushed to him, he was tied to the bed. His eyes were dull, and he kept repeating my name. His crush, Sterling Group's CEO, was planning a grand wedding with the man she truly loved. I looked at my friend’s hands. They had once played the piano with grace. This time, they were covered in countless needle marks. “You came, I knew you would...” He mustered the last of his strength to look at me. “I was a fool. I thought staying by her side was the truest form of my love for her. “I never realized I was only a stepping stone in her path. “Take me home. I don’t want to die here...”