Listen to FREE SMILE online. FREE SMILE is a Korean language song and is sung by 이효리 (Lee Hyori) and 이찬혁 (LEE CHANHYUK). FREE SMILE, from the album 서울체크인 (Seoul Check-in) OST, was released in the year 2022. The duration of the song is 3:21. Download Korean songs online from JioSaavn.