After Switching to the Heartless Path as a Substitute

[Third-person narration] I am a stand-in. Even worse, I found out on the day of my bond ceremony. The person I admired was Gu Huaichuan, the sect's number-one genius. Ten years ago, he saved my life in a secret realm. From that moment on, I gave him my heart. I even begged my father, the sect leader, to arrange our marriage. I thought Gu Huaichuan and I were destined to be together. But then I saw Gu Huaichuan protecting a frail, sickly mortal who looked almost exactly like me. It turned out that when Gu Huaichuan entered the secret realm, I wasn't the person he meant to save. I wasn't the person he wanted to bond with. The words he had spoken and the feelings he had professed were never meant for me. On the day of the ceremony, Gu Huaichuan killed my father and slaughtered my sect. His sword dripped with the blood of my father and fellow disciples as he said coldly, "Song Jiao, you're the only one who can save A Jin." Gu Huaichuan took my cultivation, meridians, and soul to sustain someone else's life. The ridiculous thing was, Gu Huaichuan didn't kill me. He said he would protect me from then on, held me close, and told me he loved me most. On the day he ascended to the position of Dao Venerable, Gu Huaichuan held out his hand to me. "Come to my side, Jiao Jiao." I looked at Gu Huaichuan, just as I had when I first fell for him as a young girl. In front of everyone's eyes in the cultivation world, I drew out the last thread of affection in my body and, covered in blood, jumped off the cliff. This was the last gift I gave Gu Huaichuan. Character dynamics: Emotionally inarticulate ex-husband -> resilient beauty <- gloomy, pitiful man Happy ending [Please note before reading] 1. Classic melodramatic angst, bitter love, changing love interests, and an ex-husband's long road to winning back his wife. 2. The love interest is a virgin. The protagonist is a charming, overpowered, level-up type who isn't perfect. 3. I'm writing the kind of melodramatic story I want to read, just for myself. Please discuss rationally and don't make personal attacks. Please check out my upcoming novel, The Shared Moonlight of Noble Academy [Reborn]. Fu Sui is the shared moonlight of Shengli University because he is so beautiful. Besides his looks, which everyone praises, he has excellent grades and treats people kindly. He's also the younger brother of Yuan Qi, heir to the top-tier Yuan family. He is the most popular campus beauty after the F4… But nobody knows that Fu Sui is just the son of a poor housekeeper who was suddenly plucked from obscurity and adopted by the Yuan family. And he has already died once. - After being Reborn, Fu Sui is bound to a System. The System tells him that this is a campus romance novel set in an elite academy. The protagonist is a kind, poor girl who gets into the academy through her grades and then meets the school's F4. After enduring bullying, amnesia, a car accident, kidnapping, and other hardships, she finally finds love. And he is everyone's moonlight in the novel, shining high above them. Everyone loves him, but can never have him. He is an essential part of the protagonist's romance with the F4. But the plot has somehow gone off track, so the world has to send the System to help him put the story back on course. - The System thinks Fu Sui truly deserves to be everyone's moonlight. When Ling Shixu, one of the F4 with a fiery temper, orders him around, he never shows the slightest reluctance. When Ling Shixu cruelly picks on him, he smiles indulgently. "I know you don't want to be like this, Ling." With Yuchi Heyuan, who is gloomy, withdrawn, and suffers from severe germophobia, he patiently listens to his innermost thoughts and helps him overcome his fear of germs, offering gentle encouragement. "I believe you'll get better, right?" The System watches Fu Sui steadily follow the moonlight plot, and victory seems just around the corner. Until... The System sees Fu Sui in the bathroom, his hand on Ling Shixu's shoulder as Ling kneels in front of him. System: Host, what are you doing?! Fu Sui smiles faintly. "System, can't you tell? Ling Shixu wants to be friends with me (^_^)" System: Why would someone with such severe germophobia as Yuchi Heyuan let you write on his body? And why are you making him eat the cream off your hand? Ahhh! Fu Sui lowers his gaze to Yuchi Heyuan, whose allergy has raised dense red welts across his skin, yet who is still licking them carefully. He smiles. "System, did you forget? I'm helping him overcome his germophobia (^_^)" The System even sees Yuan Qi leaning against the second-floor railing, a cigarette ember glowing between his fingers. Fu Sui stops and looks up. "Yuan, isn't it inappropriate to smoke right in front of the student council president?" Yuan Qi doesn't even try to hide it. He looks straight at him and smiles mockingly. "Then tell me, Mr. Student Council President, is it my turn to be played with?" The System watches as the F4 and even the protagonist pursue the moonlight relentlessly. This world has gone completely off the rails! - Even if you see through my fake mask and know I'm vicious, vain, and nothing but a pretty face, will you still love me as you did before? Character dynamics: Refined, self-serving, and repressed protagonist x dark-hearted, born-to-rule love interest Theme: Even after facing setbacks, keep living a bright and happy life.