I Ascended After Playing a Tragic, Powerful, and Beautiful Master

[A dark, deranged, mentally unstable top x a beautiful, strong, tragic bottom who keeps the situation under control; master and disciple, with the disciple younger] [The “pretending to be beautiful, strong, and tragic” in the title isn't an act by the bottom. He really is injured, but deliberately lets his enemy hurt him because dying will let him ascend and save the world. You get the idea.] Mu Liyuan was an orphan with no parents, raised by his master. His master, Jiang Yuebai, was the foremost sword cultivator of his age, peerlessly elegant and otherworldly. After taking him as a disciple, he treated him with warmth and patience, granting his every request and personally teaching him to read and wield a sword. Mu Liyuan admired his master. He had only two wishes in life: first, to find the people who killed his parents and avenge them; second, to grow up and one day confess the feelings he didn't dare put into words. At nineteen, Mu Liyuan finally learned who had killed his parents. It was the master who had raised him for ten years. -- Jiang Yuebai was recognized throughout the immortal sects as a peerless prodigy. As a young man, he received a prophecy from the Immortal Emperor: “You are destined to ascend and save the world.” But no one else knew that the path to his ascension would be drenched in blood: someone he hated deeply had to kill him with their own hands. During the war between immortals and demons, after wiping out the demon clan, Jiang Yuebai spared one demon child, erased his memories, and took him as a disciple. If the child grew up and sought revenge, Jiang Yuebai wouldn't fight back. He could use his death to ascend, and they would owe each other nothing. Once grown, the disciple learned of his demonic origins and, just as expected, fell into darkness and madness. He returned to the Abyss of Demons, spent three whole years cultivating the demonic path anew, and swore he would make Jiang Yuebai pay. When the two met again, they faced each other across a bloody battlefield, their eyes blazing with hatred. A storm of blood raged, and crimson flames filled the sky. Jiang Yuebai had been waiting a long time for this day. Looking across the flames at the person opposite him, he said calmly, “If you want revenge, come for me alone. Kill me or torture me, as you please.” The disciple silently watched him for a while, then walked closer. “Anything I want?” Jiang Yuebai waited for him to attack with his sword. Instead, the disciple's next words were: “Then I want to sleep with you.” “For three thousand years after that, I gazed up at the sky, but the moon was nowhere to be seen.” [Before you read] 1. The original blurb was too wordy, so I made it more concise. Master and disciple, with the disciple younger. 2. A love-and-hatred, mutually destructive romance. The bottom killed members of the top's clan, and the top went mad and took revenge on the bottom. 3. Both the romance and plot have lots of twists. If something seems strange, please don't worry. The foreshadowing will be explained later. * The story is told mainly from the bottom's perspective, but there are plenty of chapters from the top's perspective too. The author likes writing the top's conflicted love and hatred for the bottom. The top's jealousy, pain, and madness over the melodramatic misunderstandings also need his perspective, so the dual-perspective option is enabled. Theme: May I be like the stars, and you like the moon, shining together night after night.