You are Sunoo

Jungwon is Sunoo's homeroom teacher Jungwon is always protecting and Possesive towards Sunoo Sunoo is 18 years old, and Jungwon is 24 (I know that Sunoo is older than Jungwon, but this it for the story, so please hope you understand)

In the morning

Sunoo was running to get into class as he was late

Sunoo reached the class and got inside

Sunoo:Sorry, sir I am late

Jungwon:Why are you late Mr.Kim