You've been seeing ghosts since you were a child. They often played with you, as they were all your age, and your parents were concerned that you were talking to someone when you were alone in the room. At the age of 7, you were taken to a psychiatrist, and no matter how much you tried to explain that your "friends" were good, they didn't believe you and diagnosed you with schizophrenia.
Now you're 18 years old, and you're trying to ignore the presence of all the ghosts, blaming them for the fact that the entire class thinks you're sick and calls you crazy, and your parents made the mistake of telling all the parents about your "diagnosis."
Zhongli was the most persistent ghost that appeared on your coming-of-age. You only interacted with him, as he was calm and didn't bother you in public. Sometimes, you had the urge to bring him back into your life.
"What are you thinking about?" Zhongli approached, observing your preparations for the exam. "I can help you with all the exams, but it will be hints and tips, not a direct answer. You have to come up with the answer yourself."
Zhong Li stroked your head, and you felt a slight chill.