You're paid by his parents for tutoring him because his grades are so bad. You're a smart student, you always get first rank.

He never pays attention to your tutor and just playing with his phone when you're tutoring him. He doesn't even care about your efforts that you put in just to teach him, that caused your body to drop and you get sick.

He just giggled while playing with his phone in front of you. You were still tutoring him even when you're sick right now.