Students pass notes, as I've observed before. And then teachers – at least, curious and somewhat authoritarian teachers such as myself – confiscate notes, not to punish but more as a study in adolescent anthropology. But this student's note (I'm not sure if he wrote it, or his friend, and I'm not sure it matters who wrote it) is quite incomprehensible.
Without stating the boy's name, I will only point out - for those not familiar with Korean handwriting – that the boy's name is the only writing in the note. It's repeated between equals signs, except for the final not-equals sign. So you might say the content of the note, roughly, is as follows:
To Joe
Joe = Joe = Joe = Joe = Joe = Joe = Joe = Joe = Joe = Joe = Joe = Joe = Joe = Joe = Joe = Joe = Joe = Joe = Joe = Joe = Joe = Joe ≠ Joe
From Joe
As the title says, this seems like narcissism, with an existential crisis right at the end.