Group B1A4 is to make an OST track for the MBC fantasy sitcom "The Thousandth Man."

B1A4 took part in making the OST for "The Thousandth Man," that is to premiere on the 17th. They sang the song "Hey Girl."

The song "Hey Girl" was written by Ji Hoon and produced by Park Sung Ho and Oh Chang Hoon, who performed with "One Shot." B1A4 perfect the song that shows their colors, and the song is a fun song that is to be the main title song, "Hey Girl." 

The sitcom that B1A4 sings an OST for, is about a 'Nine tailed fox' that matches with the trend these days. It is a new style of a fantasy sitcom.

Meanwhile, "Hey Girl" will be on online music sites on the 14th.