Kim Bo Kyung�is singing the Korean version of her previously released song "Promise", "I Know", for Part 5 of the 'My Lovely Girl' OST!
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"I Know" is composed and arranged by Yoo Hae Joon, and written by Jang Yoon Suh and Choi Han Sem. Listeners could also hear the 16-member orchestra that took part in the accompaniment for the R&B song which expresses Se Na (f(x)'s Krystal)'s love for Hyun Wook (Rain).
Listen to the soothing song above!
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