The duo of Davichi will be lending their voices for the official soundtrack of KBS’s new Wednesday-Thursday series, ‘IRIS 2’.

Titled “Do You Not Know”, the song is a ballad number that includes magnificent 70-piece orchestra. Lee Haeri and Kang Min Kyung are said to have performed the sensitive song with great emotions.

Davichi members said, “Since Baek Ji Young received a lot of attention with the song “Don’t Forget” for ‘IRIS’, we feel a bit of pressure, but we also want to get a better response.”

A video teaser has been also unveiled, featuring some highlights from the series with a snippet of the upcoming OST track playing in the background. Check it out below: