On July 24, rookie idol group Big Star and girl group SISTAR revealed a picture.

Big Star member FeelDog posted on his me2day a picture of their group with SISTAR, showing their close friendship. They are all seen posing for the camera, with Hyorin from SISTAR holding up Big Star's debut album.

Internet users commented, "They look like they could be a co-ed group", "They look so close" and "I hope that their friendship will last for a long time."

Big Star has debuted with their title song, "HOT BOY."