Han Young Joo - 빈자리 (Vacancy) (OST The Secret House Part.5)
Han Young Joo - 가지마 (Don't leave me) (OST The Secret House Part.4)
Han Young Joo - 나쁜 꿈 (Nightmare) (OST The Secret House Part.2)
Han Young Joo - Goodbye (OST The Secret House Part.1)