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Smile Boy
- Artist
- Lee Seung Gi & Kim Yuna
- Album
- Smile Boy
- Released
- 2010.06.01
- Tracklist
- Smile Boy (스마일 보이)
- Artist
- Lee Seung Gi
- Album
- Smile Boy 2010
- Released
- 2010.06.18
- Tracklist
- Smile Boy
- Information
"Smile Boy" is the collaboration single released between Lee Seung Gi and Kim Yuna. The song was released as cheer song for the Korean team on 2010 FIFA World Cup. Only a couple of weeks later Lee Seung Gi released a solo version of the song as his fourth digital single.