Seo In Guk, who already does a good job playing Kang Woo, the second lead in the drama "The Master's Sun," has found another way to make the drama even more likeable. He contributed a song to the drama's already popular OST.

His new song, "No Matter What" is a song about letting go of fear and letting in love. It is supposed to be about Kang Woo's feelings for Gong Hyo Jin but it also seems fitting for all the characters in this drama.

Gong Hyo Jin's character is a woman who is afraid of ghosts. So Ji Sub's character is a CEO who is afraid of love because he was betrayed.

In "The Master's Sun," Seo In Guk's character is a mysterious security man assigned to follow So Ji Sub's character around. To get the inside scoop on So Ji Sub's behavior he befriends and pretends to like the character played by Gong Hyo Jin but then he really falls in love with her.

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