I Rely on My Partner's Fear Level to Survive

After Lu Cheng died, he got a System. Only then did he learn that he was a cannon fodder character in a xianxia novel, destined to die from the start. The novel's protagonist bottom was the fiance his family had bought for him when they were children. The protagonist bottom had lived a hard life in his previous life. After being reborn, his personality changed completely. He used Lu Cheng in every way, and eventually sold him to an evil cultivator before leaving for the sect, squeezing out the last bit of his value and making him die after enduring endless torment. Now, Lu Cheng has become some kind of spirit. The only way he can cultivate is by making the protagonist bottom afraid. So Lu Cheng picks up his own skull and decides to follow the System's advice: every time he appears, he'll bring his own horror-movie background music. It works like a charm, until one day the System malfunctions. Just as Lu Cheng is scaring the protagonist bottom silly, the background music starts automatically playing dramatic romance-show music. Lu Cheng watches as the protagonist bottom goes from bewildered to trying not to laugh. Lu Cheng: ... What is he supposed to do if the protagonist bottom isn't scared anymore? Blurb from the bottom's perspective: Shi Qiu transmigrates into a xianxia novel full of love rivals, which he once read. The original owner sold his evil, villainous fiance to an evil cultivator, then used his good looks to thrive in the sect, living more comfortably than people with proper connections. By his calculations, his fiance is about to become a vengeful ghost and come after him. Shi Qiu is a troublemaker, but he's terrified of the dark and of ghosts, so he decides to save himself by using love to reform the villain. While trembling with fear and putting on all sorts of airs, he suddenly hears modern songs coming from the villain. They're even songs from his own childhood. Buddy, that is just not cool! P.S. Stoic-faced. Theme: Find your truest self again as time passes.