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1
Oh Won Bin – 친구로만 알았는데 (I Thought We’re Only Friend) [Heartstrings OST Part 2] [Rom|Eng Lyric]
By : ElyDha Subs.
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2
Heartstrings (OST Special) - I Don't Know - M Signal
By : K OST.
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3
Heartstrings (OST Special) - Even If It's Not Necessary - FT Island
By : K OST.
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4
FT Island - Even If It's Not Necessary(Heartstrings OST)
By : Miho's KPOP Channel.
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5
Because I Miss You그리워서-Jung Yong Hwa-Hangul,Romz,Eng Lyrics.
By : K T Shii.
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6
Even if it's not necessary by Lee Hong Ki (HEARTSTRINGS OST)
By : anjiel blue.
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7
M Signal - I Dont Know [Heartstrings OST Part 2] [Rom|Eng Lyric]
By : ElyDha Subs.
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8
BY CHANCE. Heartstrings
By : balahaaka.
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9
Heartstrings OST - I Don't Know - M Signal
By : OSTこんにちは.
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10
Heartstrings OST Special
By : Daniela Lopez.