On April 22nd, Girl's Day released their OST participation for MBC's weekend drama, "Shiny Shiny Shining"! Titled "If You Give Your Heart", the song is a slow and smooth ballad that brings out the vocal talent of the members.�As it contrasts against the more cutesy style of their current title track, "Twinkle Twinkle", fans were delighted to hear a different and more feminine side to the girls. Check it out below and remember to support by purchasing the music! Source: JoongAng via Nate