Kim So Hyun - 내 맘이 들리지 않니 (Don't you hear my heart?) (OST Ruler: Master of the Mask Part.16)
Kim So Hyun - The Legend Becomes History
Kim So Hyun - 꿈 (Dream) (OST Let's Fight Ghost Part.5)
Kim So Hyun - 비밀 (Secret)
Kim So Hyun - Nothing Is Easy (OST Noble, My Love Part.2)
Kim So Hyun - Reset
Kim So Hyun - Erase The Love Of Love