Who Is The Antagonist In 'Turning My Junior Sister Into A Mary Sue In This Yuri World'?

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.

My adopted Omega sister, Maya Bardolph, is known to be innocent and kindhearted. Before the practical admission assessment, I specifically tell her not to interfere in any way. But she secretly puts a prohibited performance booster into my water bottle. I am reported for cheating on the spot. My results are canceled, and I am permanently blacklisted. When I break down and demand an explanation, she bursts into tears, looking pitiful and wronged. She weeps, "Sierra, I just wanted you to get first place... I didn't know things would turn out like this." My boyfriend, Dale Ashshade, immediately pulls her into his arms and blames me instead. He scolds, "She is only trying to help. Why are you being so harsh to her?" My parents chastise me frostily as well. "Isn't it just one practical assessment? She's an Omega. She doesn't understand these things. Can't you be more patient with her?" To apologize, Maya smilingly brings me a cup of herbal tea later. "Sierra, I made this just for you. Promise you won't be mad at me anymore after you drink it, okay?" Without thinking much about it, I drink the tea. But what she uses to brew the tea is highly poisonous silver oleander. I die from the poisoning. Outside the emergency room, Maya cries hysterically, "I'm sorry! I didn't know silver oleander is poisonous... I just wanted to apologize to Sierra..." When questioned by the Enforcers, Dale calmly gives false testimony. "After Sierra was caught cheating, she became mentally unstable. She couldn't accept how things turned out and took silver oleander to kill herself..." When I open my eyes again, I return to the day before the assessment.

My roommate was obsessed with those cheesy “milk-scented girl” romance stories. She wanted to become the kind of heroine from those books. Tiny, soft, and delicate, the type who was supposedly so sweet that even her farts smelled like milk. So she went completely overboard. She lived on dairy. Drank milk nonstop. Even took milk baths. She tried everything, all because she was convinced she’d eventually run into her destined male lead. I believed in letting people make their own choices. What I didn’t expect was for her to go after my boyfriend, the guy I’d basically grown up with. One day, she sent him a carefully posed thirst trap. He replied with one word. “Get lost.” Then she proudly showed me the screenshot, like she’d won something. “Only girls like me, soft and sweet and irresistible, deserve a powerful man’s obsessive love.” “Don’t be fooled by how cold he is now. He’ll be crazy about me soon enough. He’ll want me all to himself.” I was just about to tear into her when a row of floating comments suddenly appeared in front of my eyes. “Fresh one, guys. This host is bold. Coming in with a thirst trap right away? Nice.” “Wait, what? Isn’t this just harassment? The male lead already has a girlfriend.” “Bro, I think you’re in the wrong livestream.”

I transmigrated into the role of a gorgeous villainess, tasked with tormenting my childhood buddies. I forced Maddox, Mr. Tough Guy, into putting on a sexy dress, essentially killing his chances of a social life. I grabbed the bottom of the ever-aloof Zane and made him red in the face. I kicked Damian, the crybaby, into the ground, and all he could do was glare at me through his tearful eyes. My aggressive antics only fueled their resentment. “One of these days, I’ll get you.” I winked at them without a care. “I’ll be waiting.” The day they crossed paths with the female lead would be the day I left this world. Their revenge didn’t scare me one bit. Little did I know, the time would come when I would be proven wrong. While I scrambled to get away in tears, he said softly, “Save your strength. The night is still young.”

After transmigrating into a novel, I realized the heroine and I had the exact same name. Naturally, I thought I had transmigrated into the female lead. So I marched straight to the man who was still a broke nobody at the time, threw all caution to the wind, and pounced on him like I had plot armor protecting me. He even glared at me with red eyes and told me he hated me. I honestly thought he was just into the whole push-and-pull thing. Everything shattered when the real heroine showed up and I finally understood one thing. He actually hated me. Heartbroken, I packed my bags and got ready to disappear. The next second, he pinned me against the wall. "Where are you going? Already bored of me, sweetheart?"

Blaire was out on a cruise with her family for the first time. However, due to a certain circumstance, the moment she opened her eyes, she arrived in the world of novel as Victoria Nightingale, the Forgotten Princess of the Kristania Empire. In order for Blaire to go back to her world, she must fulfill the conditions Victoria set before her: Win her father's love and make herself as the Empress. As a side character, it is completely impossible to change the flow of the story unless she becomes a villainess who breaks her miserable and cruel fate. Upon meeting the 2nd Male Lead of the novel, an idea crossed her mind. "If you agree to the contract, I will become your temporary wife and together, we will kill the Emperor!" Will Blaire succeed and be able to go back to her world?