goldenjewelOST's video: Heartstrings OST 4 I Don t Know - M Signal

✿•*¨`*•. (¯`v´¯) You've Fallen For Me / Heartstrings OST Part 4(¯`v´¯) .•*¨`*•✿ ♥ Released Date: 2011.07.20 Genre: OST Language: Korean 01 모르나봐 - M시그널 02 꼭은 아니더라도 - FT 아일랜드 The song played for the first time during the ending scene on the sixth episode, and was officially released on July 20th. "I Guess You Don't Know" became an instant hit, as it accurately captures the sorrowful feelings of Park Shin Hye's character, 'Kyu Won', who witnessed an intimate scene between her crush, 'Lee Shin' (played by Jung Yong Hwa), and another woman. The lyrics portray someone who loves another, but the person she loves will not realize or acknowledge her love for him. Hence, it fits perfectly with Kyu Won's secret love for Lee Shin. "I Guess You Don't Know" was sung by M Signal, FNC MUSIC's newest project group.