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His OST is an acoustic, minimally remastered remake of a song titled "A Doll's Dream", originally sung by the artist Weather Forecast. The song has played a big role in the drama, as love lines began intertwining and the main characters eventually had to give up being with their loved ones in order to ensure the other's happiness.
Listen to Taeil's soothing voice above! Have you been keeping up with 'Woman With a Suitcase'?