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Sojin shared that the first book which made her cry was an internet novel titled 'Do Re Mi Fa So La Ti Do,' written by Guiyeoni. The novel was later adapted to film, starring Jang Geun Suk, Cha Ye Ryun, and Jung Eui Chul. Sojin said, "The first book that made me cry is 'Do Re Me Fa So La Ti Do,'" and revealed that her 'sugarman' is the OST from the movie adaptation of the novel.
Sounds like the novel is a big part of Sojin's childhood!