Yoon Hyun Sang and IU dropped a MV teaser for their upcoming duet, "When Would It Be."
The music sounds very dramatic, starting off with a slow piano before getting swept up by beautiful string instruments and escalating into Yoon Hyun Sang and IU's harmonized vocalizing.
SEE ALSO: Choi Baek Ho reveals surprising backstory of hit OST for IU's drama
The dark lighting, IU's emotional facial expressions, and the poignant music all work together to send chills down your spine. The full release will be on October 31.
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