Help, I'm falling for my little sister's teacher! (слэш)

Title says it all. Yoo Jonghyuk meets the love of his life in his little sister's classroom.
or
He shot a look at the clock hanging on the wall and sighed. “Mia, we’re going to be late on your first day. I promise you elementary school isn’t that different from kindergarten.”
Yoo Mia scoffed, a splitting image of himself. “No.”