professor brother

Kim Yn is a schoolgirl. Daughter of the 1 businessman in the country. She is adored by her family. everyone loves her so much. Especially her tae oppa.

He loves her so much. He can't even tolerate a single drop of tears from her eyes.
But he is so... Strict about his profession
He is the most strictest professor in his university. And most knowledgeable professor at the young age.

But he never shows his strict side to his princess. Because she is not studying at his university and also she is very well in studies

But the question is...
What happens when yn transfers to her brother's university.??
Will he start to show his strict side to her or remain like her lovely brother..??

What do you think...??