connected series of love notes scribbled in library art books convinces gawky grocery store clerk Hyun-chae (Bae Doo-na) that a mystery man - known only as 'Vincent' - is pursuing a relationship with her. Meanwhile, an infatuated pal from her high-school days - shy, quirky subway driver Dong-ha (Kim Nam-jin) - relocated to Seoul to ACTUALLY pursue a relationship with her, which she rejects in favor of the ersatz paper chase provided by her mystery man, going so far as to pawn Dong-ha off on her friend at one point.

Overview from themoviedb.org