Translation:

Changmin’s dad is a korean language teacher in a high school.
Ex-student had asked: teacher, is your son TVXQ’s choikang changmin?
Him: no, who’s that?
but if you went to the teachers’ office, his seat had an official TVXQ desktop calendar there.

Translation:

a reply: choikang changmin’s aunt (not known if it is maternal or paternal), was my music teacher in school and was proud of him

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Credits:

Screencaps via @BambitoRjn and via @ymamylim: here and here,
Translated by @snxy: here and here,
Shared by TVXQ! Express