Actors or lead stars in dramas are being featured in tyhe original sound tracks (OST) of their drama.
What is the importance of this?
Find out the impact of it:
https://www.kpopstarz.com/articles/48796/20131112/osts-original-soundtracks-ji-sung-park-shin-hye-jang-geun-suk-lee-min-ho-f4.htm
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