Characters played by Choi Ji-woo
Lee Ma-ri
Characters played by Yoo Ji-Tae
Kim Chul-soo
Characters played by Ki-woo Lee
Jung Woo-jin
Characters played by Ye-ryeon Cha
Choi Eun-young
Characters played by Hyo-jeong Ban
Ma-ri's grandmother
Characters played by Park Bo-Young
Ma-ri (young)
Characters played by Phillip Choi
Woo-jin
Characters played by Shim Eun-Jin
Ye-rin
Characters played by Lee Joon-hyuk
Min Jang-soo
Characters played by Yun Ju-sang
Professor Ahn
Characters played by Da-bin Jung
Ma-ri (child)
Characters played by Tae-young Ki
Son Ha-young
Characters played by Jee-Young Kim
Kim Ok-ja
Characters played by Ye-ryeong Kim
Ji-sook
Characters played by Hyun Hwa Kwak
Lee Eun-sil
Characters played by Seung-hyeong Lee
Choi Seung-wook
Characters played by Ji-ru Sung
Seo Tae-suk
Characters played by Hee-kyung Yang
Lee Seung-yeon