The four-member rookie girl group Rocking Doll is gearing up for their first comeback. 

On February 7th, Rocking Doll revealed more teasers for their upcoming second single 'Heart Rider'. In the teaser video, members are seen in retro-inspired stylish outfits exuding charisma with energetic beats. Along with the video teaser, the girls also revealed their group concept photo as shown below. 

Check out the teasers above and below. 'Heart Rider' is set to drop on February 14 at 2 PM KST.