So I Didn't Die After All!

One day, he woke up in a secret realm with no memories. Confused, he could recall only one name: “Jiang Kun.” He heard the street singers' tale: Immortal Master Jiang Kun of the Qingshan Sect had sacrificed himself to save all living beings, and would likely never return. Half believing it, he went to the now-declining Qingshan Sect. I can draw Jiang Kun's sword. I know the sword technique Jiang Kun created. I can enter and leave Jiang Kun's residence, ignoring the wards. That's it. I am Jiang Kun. So I didn't die after all! Back in his old place, everything seemed as it always had. But whenever he saw the damaged portrait of two people in his bedroom, he would lose himself in thought, as if he had forgotten something important. He wondered to himself, “Who is this Li Xiao, and why is he in the portrait with me?” Feeling the emptiness in his chest, he thought, He must be my cultivation partner! Perhaps because he had died once, everyone noticed that “Immortal Master Jiang Kun” had become unusually obsessed with staying alive. He took spirit pills like candy and drank herbal tea for his health every day. Even though someone at his level no longer needed sleep, he still insisted on going to bed early and getting up early. Though he was on the verge of ascending and always full of energy, a little scrape would make his eyes widen in horror as he decided he was about to die. If he accidentally lost a single strand of hair in a fight, he'd look as if the sky had fallen and pursue his opponent until their sect's protective array was smashed to bits. With bloodshot eyes, he'd insist that the sect elders cowering together in fear were plotting to take his life and deserved to die. He even went to the far north, rounded up a bunch of high-level demonic cultivators, and shut himself away with them to discuss the path to immortality. Every day, the first thing “Immortal Master Jiang Kun” did upon waking was sternly inspect himself from head to toe. Then he'd sigh with relief: Thank goodness, I'm still alive. I'm not dead. As he drank his herbal tea, he'd think, I lived another day. Being alive is wonderful. I want to live forever! ...Why is it that I can't die? Why am I the only one who can't die? Who is Li Xiao? ** Jiang Kun's soul had been destroyed while he was saving all living beings, yet somehow he was given another chance to return to the world. When he opened his eyes again, the world had changed beyond recognition. The Qingshan Sect he had founded had become a third-rate sect, while “Immortal Master Jiang Kun,” who had returned from the dead six months ago, was leading the fallen sect down a path of lawless, devil-cult excess. If that person was Jiang Kun, then who was he? To uncover the truth, Jiang Kun borrowed the name of his little disciple, Li Xiao, and climbed the Cloud Ladder to the Qingshan Sect, intent on exposing the fake immortal master himself. On his way to attack the Qingshan Sect, he unexpectedly learned that the impostor had written him and his little disciple into a couple... Jiang Kun, scowling: “Ruining my sect wasn't enough? You dare insult my beloved disciple too!” A story about someone who loses his memory while bringing his lover back to life, remembers only his lover's name, and believes he's his lover. Li Xiao (Li Xuhuai) x Jiang Kun (Jiang Xuhuai) Theme: Please fill this in carefully.