Seo In Guk - 기적은 없어도 (OST Death's Game Part.2)
Seo In Guk - Fallen
Seo In Guk - 어린 날 (Youth)
Seo In Guk - 너를 좋아해 (I like you) (OST Minamdang Part.6)
Seo In Guk - 겁도 없이 (No matter what) (OST The Master's Sun Part.7)
Seo In Guk - MY LOVE (Feat. RAVI)
Seo In Guk - 질리지 않는 노래 (BE MY MELODY)
Seo In Guk - 아득한 먼 훗날 우리가 (Distant Fate) (OST Doom at Your Service Part.7)
Seo In Guk - 함께 걸어 (Better Together)
Seo In Guk - Mint Chocolate (Feat. 40)