Rookie girl group TAHITI participated in their very first soundtrack single, and after revealing a preview earlier, the full track has now been released.

TAHITI sings the opening track titled “Don’t Know, Don’t Know” for the KBS 2TV drama, ‘The Best Lee Soon Shin’. The song is a bright, upbeat number that actually goes really well with the romantic-comedy drama.

The girl group is said to have participated in the OST to express their support for labelmate Jo Jung Suk, who is starring in the drama along with IU.

Check out the full track below: