4minute member Hyuna poses in the photo for her second mini-album "MELTING," dropped on October 21, 2012. [Cube Entertainment]

4minute's Hyuna is supporting Indonesian rookie boy band by rapping for the group's debut album.

Hyuna took part in S4’s debut song “She is my girl," the group’s agency Rainbowbridge said in a press release Wednesday.

The tune features strong beat and melodies produced by hit maker Kim Do-hoon, who was in charge of CNBLUE’s “Hey You,” FTIsland’s “Hello Hello,” Juniel’s “Illa Illa” and BEAST’s “Beautiful,” the officials said.

S4 is the winner of “Galaxy Superstar Season 1,” a multinational audition program co-hosted by Korean and Indonesian firms earlier this year. The first collaborations singing competition between the two countries was aired on Indonesia's major broadcaster Indosiar.

Following the program's rules, the quartet has been receiving an intense nine-month training. For their grand debut stage, S4 will go back to Jakarta for "Volume Up Party" to be held on October 31.

To support the budding boy band's successful beginning, 4minute members will team up with the boys on the stage, Rainbowbridge officials explained.

Meanwhile, Hyuna is set to have the first televised comeback performance of her second solo mini-album "MELTING" on KBS’ “Music Bank” on Friday.

S4 members Jeje (left), Alif (second to left), Arthur (second to right) and Firly (right) pose together in their profile picture. [Rainbowbridge]

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