Her official debut as a solo artist was on October 24, 2012, with the single, "1, 2, 3, 4," followed by the full album, "First Love." In 2014 and 2015, Lee Hi promoted with (then) 2NE1 member, Park Bom and AKMU member, Lee Suhyun in project groups BOM&HI and Hi Suhyun.