Although he has made a name for himself among international fans as Running Man's 'Sparta-Kooks' Kim Jong Kook is first and foremost a singer. Today, he gets back to what he does best with a melodic track for popular drama 'Good Doctor'.

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"Don't You Know" is meant to reflect the lead characters feeling and will be used as he confesses his love for the first time. The music video shows scenes from the drama itself as the two leads' love blossoms.

Are you glad to have Kim Jong Kook the singer back?