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Song Ji-eun, better known mononymously as Jieun, is a South Korean singer and actress best known as a member of the South Korean girl group Secret.
Aside from her group's activities, she has released several solo songs and participated in various OSTs.
Wikipedia
Once the shining star of the silver screen, award-winning actress Su-yeon crashes and burns after a notorious DUI incident. Attempting a dazzling comeback through a heartfelt essay, she finds the world's reception icy. Battling depression, Su-yeon engages in a heated argument with Ga-yeong, with whom she lives, and resorts to binge drinking to relieve stress. In a drunken stupor, Su-yeon wakes up to discover Ga-yeong stabbed to death with a knife. With no recollection of the situation, Su-yeon receives a letter asking, "Do you deserve to be an actress?" Determined to cover up everything, she embarks on an adventurous journey risking her life, realizing that someone is watching her.