Even though ZE:A's Siwan is off for his mandatory military service, he's still touching fans' hearts in more ways than one.

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In addition to currently starring in MBC's 'The King Loves', Siwan has released a special gift to his fans in the form of an OST for his drama! Part 4 of the drama's OST series is "My Heart", a soft, melodic ballad depicting Siwan's character Wang Won's feelings.�

Listen to Siwan's OST above and recap scenes from the drama!