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A made-up disease that only rich kids get because they study too much and drink too much coffee. It makes you tired, sick, and insane.
'I got Daewonbyung yesterday. I failed math and threw up in my mom's car.'
'Daewonbyung? That's what I have. I can't even look at my textbook anymore.'
'I have Daewonbyung. My brain is dead, and my stomach is mad at me.'