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The hidden personality of Mr. X, along with Na Na, reflects Do Hyun's healing process.
Ji Sung
Cha Do-hyun / Shin Se-gi
Hwang Jung-eum
Oh Ri-jin
Park Seo-jun
Oh Ri-on
Kim Yoo-ri
Han Chae-yeon
Oh Min-suk
Cha Ki-joon
Kim Yeong-ae
Seo Tae-im
Shim Hye-jin
Shin Hwa-ran
Kim Yong-geon
Cha Geon-ho
Ahn Nae-sang
Cha Joon-pyo
Myung Se-bin
Min Seo-yeon
Ko Chang-seok
Dr. Seok Ho-pil
Choi Won-young
Chief Ahn Gook
Kim Hee-jung
Ji Soon-young
Park Jun-gyu
Oh Dae-o
Kim Na-woon
Yoon Ja-kyung
Kim Il-woo
Cha Young-pyo
Kim Hyun-joo
Baek Jin-sook
Baek Chul-Min
Alex Kang
Kim Hyeong-beom
Chief Choi
Cho Chang-geun
Kang In-kyu
Kang Bong-sung
Shin Seon-jo
Choi Hyo-eun
Joo Mi-ra
Kang Soo Jin
Lee Young-seon