Heeseung is your brother's bestfriend

Your parents are in a business trip, they told your brother to take care of you, but instead he acts strict and doesn't let you go out.

Not until his bestfriend, Heeseung came, you saw both of them in the living room, hanging out, it's the perfect moment for you to sneak out, you were now heading downstairs but then you saw Heeseung.

"..going out, little bunny?" ** he said in cold/serious tone, you were about to shush him but suddenly you tripped and fell into his arm.