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This is [The Hypnotized] Korean OST. Done by one of Korean best film music composer Jang Young Gyu([Foul King] - [The Coast Island] - [Bizarre love Triangle] - [The Uninvited]), and was famous for UhUhBoo Project Sound & ex-DoMaBaem stuffs! This went OOP long ago, so I'd recommend you to get this before too late!