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!
SEE ALSO: BREAKING Shin Min Ah & Kim Woo Bin announce their marriage!
"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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