Areumdawossdeon Wooriegye

Girl has had a crush on the boy next door since forever. Boy is not interested in the slightest, is scornful and dismissive of her. Ugh.

Enter a sports jock, a star swimmer with a kind and generous personality, who takes a great liking to girl.

Suddenly the loser next door (typical dog in the manger) is piqued and jealous that she's actually got someone interested in her, and ends up behaving badly.

This goes on: we see the years move forward semester by semester.

Kdramas have a ridiculous habit of getting their middle aged and wrinkled actors to don a bad wig and play themselves back in high school. Luckily this doesn't happen here.

The female lead plays an effervescent high schooler so effectively and when she's all grown up in her 30's her body language and mannerisms change accordingly. I was so impressed with her acting ability and her cheerful smile.