Actor and�occasional�OST singer, Kim Nam Gil has just released an OST for the drama 'Queen of Ambition'.

The song, titled "You Don't Know", will be used as the theme for�Kwon Sang Woo and Soo Ae's love. �Making their scenes even more melodramatic and emotional.

"You Don't Know" highlights Kim Nam Gil's mid-low voice very well, matching with the mood and atmosphere of the drama. �There were many expectations of this song since it was produced by acclaimed musical director Park Sun Joo.

In other Kim Nam Gil news, he recently concluded a fan meeting tour in Japan, returning to Korea on January 13th.

Listen to the hauntingly beautiful track below, isn't it just perfect as the drama's main OST?