Share Read on Mobile Enter Reading Mode Lovelyz's Kei sings beautiful OST 'Star and Sun' for 'Monarch - Owner of the Mask'! Posted on 2017-05-25 20:47:04 by kingjoe20930 Lovelyz's vocalistKeisang a beautiful OST for currently airingMBCdrama, 'Monarch - Owner of the Mask'! Comment