Song Joong-ki Yoo Si-jin Actor Song Hye-kyo Kang Mo-yeon Actor Jin Goo Seo Dae-young Actor Kim Ji-won Yoon Myung-ju Actor Kang Shin-il Yoon Gil-joon Actor Kim Min-seok Kim Gi-bum Actor Lee Seung-joon Song Sang-hyun Actor Hyun Jyu-ni Pyo Ji-soo Actor Lee Yi-kyung Kang Min-jae Actor David Lee McInnis David Argus Actor Jo Jae-yoon Jin Young-soo Actor Jeon Soo-jin Ri Ye-hwa Actor Park Jun-geum Chi Hoon's mother Actor Hahm Young-hoon Executive Producer Bae Kyung-soo Executive Producer Lee Eung-bok Director Kim Eun-sook Writer Kim Won-seok Writer