King2hearts is definitely one of the best dramas I've ever seen, but I wouldn't exactly clasify it as a slow paced romance, is more like the romance has too many obstacles on the way making the speed slow. And even though there are a lot of cute moments the plot is too heavy to call the show cute. If you want something cute and slow I would recommend something in the lines of "smile, you", "reply 1997", "personal taste", "you're beautiful", "dream high", "secret garden" and so on. But don't give up on K2H, it is definitely worth your time.