They grew up together and were good buddies, but someone just fell in love with them.
She: Her grades are above average, she is eloquent, she is willing to complain, and she is recognized by the whole class as "not easy to mess with". He seems to be a social butterfly with many friends, but inside he has a secret territory that only he knows about.
He: A top student, good looks, dull personality, and intangible expression of joy and anger. It's not that I'm deliberately aloof, I'm just born with low mood swings, and I'm too lazy to expend energy on people and things I'm not interested in.
But they are childhood sweethearts