The pair got to know each other during 'Lipstick Prince', and have remained close even after the variety show ended. The interaction started with SF9 asked fans to change up the lyrics to their song "O Sole Mio". Eunkwang saw the event and responded with his version, which he sang multiple times during BTOB's behind videos.
SEE ALSO: BTOB celebrates 13th anniversary with 3-day fan concert '3,2,1 GO! MELympic'
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