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A man is tormented by the death of his girlfriend in an accident that occurred before his eyes, he decides to secretly help her sister fulfill her dream of becoming a songwriter.
Krystal Jung
Yoon Se-na
Rain
Lee Hyeon-wook
Cha Ye-ryun
Shin Hae-yun
L
Shi-woo
Gong Seung-yeon
Seo Yoon-ji
Jo Hee-bong
Kang Tae-min
Baek Seung-Heon
Roy
Kim Jin-woo
Seo Jae-young
Lee Ho-won
Kang Rae-hun
Kim Ki-bang
Yoo Sang-bong
Kim Hye-eun
Oh Hee-sun
Lee Yoo-jun
Bool-gom / Brown Bear
Na Hae-ryung
Yoo Ra-eum
Lee Xia
Yoon So-eun
Park Young-kyu
CEO Lee Jong-ho
Alex Chu
Bae Sung-jin
