Episode 10 S01 E10

Song Seung-heon (as Yoon Jun Seo) Song Hye-kyo (as Yoon Eun Seo / Choi Eun Seo) Won Bin (as Han Tae Seok) Han Chae-young (as Choi Sin Ae / Yoon Sin Ae) Han Na-na (as Shin Yu Mi) Choi Woo-hyuk (as Yoon Jun Seo (Young)) Moon Geun-young (as Yoon Eun Seo (Young)) Lee Ae-jung (as Choi Sin Ae (Young)) Sunwoo Eun-Sook (as Im Gyeong Ha) Jeong Dong-hwan (as Professor Yoon) Lee Han-wi (as Yoon Ji Hwan) Kim Hae-sook (as Kim Soon Im) Kim Na-woon (as Kim Mun Jeong) Kim Hyeong-jong (as Choi Jong Cheol) Seo Yoon-jae (as Lee Gang Hee) Ahn Seo-jung (as Jae Gyeong)

romance