MBC Drama Series [Mr back] Fourth OST is all-day is the song with the heroine Jang is loaded directly expresses the heart of the Milky Way in the play as it is. Jang showed a passion for singing to express yourself better than anyone murderous schedule despite the heart of the Milky Way is not even sleep well because of the drama shooting time.From the planning stage to the Jang already tried to hold her red socks team composed voice and emotion due to her voice a little emotion throughout the recording the day is a song by iteotdamyeo can feel the vague heart of the Milky Way in the play, her voice the praised. 'Gotta wait all day, you gotta be thinking of you all day ...' is expected to have a beautiful melody and affectionate voice of Jang met only expresses the heart of the Milky Way 'all day' to receive a lot of love with the drama [Mr back] .