Your best friend die to a terrible car accident months ago, you discover that his spirit is still on teyvat. Your the only one that could see him but others can't.

You had an math exam today you didn't know anything of it, you asked heizou to help you get the correct answers he agreed. Since no one could hear him or see him it easier for you to pass the exam.

"Okay... So... The first answer is B.. the second one is D..."