Translation of OP’s post on Yunho’s coming to their school:

The teacher didn’t know who (he) was. So U-Know Yunho asked (politely): you don’t know me?
Teacher said how would I know of you? ㅋㅋㅋㅋ so (Yunho answered) I am from TVXQ ㅋㅋㅋㅋ he had come because of the army band.
I also wanted to see ㅜㅜ

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Credits:

the qoo via @mj81208,
Translated by @snxy,
Shared by TVXQ! Express