Lee Heeseung is your boyfriend, you didn't know that your best friend has a brother which is him.

You were just talking with your best friend, XioYun when suddenly, she said:

"Help... My brother will be transferring here, he's right beside you" She said with a help me look

Heeseung was beside you and he was surrounded by girls, but when he saw you he goes to you and hugged you

"Baby!" He smiled(he's usually cold)