Sorry, visuals, acting everything is top notch. The story is impactful, emotional, mysterious, keeps you on your toes and many satisfying moments. That was my very first Kdrama with song hye-kyo but I insteadly fell in love with her acting and natural, elegant beauty. In every scene she's in I couldn't take my eyes of her! the way she carrys herself in that drama is just amazing. Romance in that show is just a side plot and gets relatively less view time. But non the less the romance is sweet, mature and kinda healing.