After the Universally Hated One Was Sacrificed, Everyone Regretted It

An old-school groveling arc at first, then a story about a beloved heartthrob, with a fierce rivalry for his affection. Everyone secretly loves the protagonist. A powerful, aloof sword spirit with an obsession for cats × a cat demon, foolish and innocent at first, then sharp-witted and adored by all Qing Li was kind to everyone. He was always hanging around the Crown Prince, following him everywhere like a little shadow, and even saving a portion of his favorite pastries especially for him; He also loved lying across the Imperial Preceptor's lap to listen to all kinds of tales about ghosts and spirits, and was always clinging to his side; He was especially close to his sworn elder brother and always listened to him. He even thought his brother was the Song family's true young master; He was just a little fool like that. But one day, Qing Li died. On his sixteenth birthday, the Imperial Preceptor took him to the Observatory, where a divine sword pierced his heart. His sworn brother gained the power he wanted, the Imperial Preceptor won his freedom, and the Crown Prince successfully ascended the throne... But later, the new emperor would wander the Observatory late at night, carrying a plate of pastries and calling Qing Li's name over and over; The Imperial Preceptor would lie awake all night, casting countless divinations, hoping only to find the little fool he'd once known; Whenever the head of the Song family got drunk, he would go to the secret chamber deep inside the Song estate, wanting only to see Qing Li's face once more; Qing Li was dead, but had become a ghost. He had lost all his memories, retaining only his aversion to them.