Recently Girl's Day's Sojin and Block B's Zico came together on a song for the popular SBS drama "Mask."

The track, titled "It Hurts," was written by both Zico and Sojin. It conveys a strong sense of emotion with its soft melody and powerful vocals. The soft piano and vocals capture listeners from the beginning. Zico's strong rap style and Sojin's beautiful vocals complement each other perfectly heighten the mood of the song.

Mask tells the story of Ji Sook, who starts living as Eun-Ha after her own life takes a difficult turn. The drama features a number of well-known celebrities including Soo Ae, Yeon Jung Hook, Joo Ji Hoon, Yoo In Young, and INFINITE'S Hoya among others. According to Asia Economic, Mask achieved first place in ratings with their first episode on May 27. The drama has dominated ratings since.

Mask has also earned attention for its previous OST, "Just One Day," written and performed by Lyn.