Ahead of their comeback, idol group B2ST has participated in the OST for KBS's new drama, 'Big'!

Titled "Hateful Person", the OST track reveals a fresh transformation to the boys' style that's different from their dance group image.

Produced by Sweetune, the mastermind behind a number of hits for groups like KARA and INFINITE, the song is a refreshing combination of synth and guitar sounds, perfectly fit for the bright atmosphere of 'Big'. The lyrics sing about a man who comes to love a woman without letting her catch on. Because he doesn't express his feelings, she consequently falls in love with another man.

Sweetune expressed, "B2ST's 'Hateful Person' has a refreshing feel that is perfect for the hot summer heat."

The members of B2ST also expressed, "We're glad to release a new song under B2ST for the first time in a while. We're all enjoying the drama itself. Please show your interest and support for not only our OST, but also our upcoming comeback."

Without further ado, listen to the track below!