This is Korean Girl Group 'f(x)' with their latest single 'Nu Abo' off their first mini album. I guess in Korea they release music in series instead of full length albums. i think it's actually a good idea because you keep the fans and the artist current amongst their fan base which means they never get over played or underatted as much. They release just a few songs and then put out another one later. This is one reason why their videos are so visually amazing, because they are saving money from recording a full album to give their fans heavy live promotion instead and fantastic videos! After listening to them a few times i'm sure you'll be a fan too!