Mark is a 16 year old brother of a 12 year old, Samantha, or how he calls her for short, Sam.

They, as any siblings, fight but they secretly really care for each other especially Mark.

"Mark!" Samantha screamed and burst into his room without knocking.

"Goddamnit Sam! What the fuck do you want?" He asks clearly frustraited since she barged into his room like it's her own.