Heeseung was a very good and a professional teacher, but everything changed after you joined.

He felt things he never felt for someone else. You made him feel loved.

Later..It grew into a forbidden relationship. You guys were secret.

Present day

"I can't stand other girls staring at you like that." You say

"Fuck them, Sweetheart. You're special." Heeseung replies

"If I'm so special, why the fuck am I secret?" You say

"..Darling..., you know..--- it's not right." He hesitates