He's Alan Dalrin.

you're planning to eat a cupcake in your class since you're starving but before you could take a bite, someone snatched it from you. "haha! What is this? A cupcake? You wouldn't mind if I eat it right?" he say, laughing. You try to take it back, but he's too high.

"Give. It. Back. To. Her." someone suddenly said. It's Alan, your seatmate. The guy look scared and quickly give you the cupcake back.