F(x), are a South Korean based girl group under SM Entertainment, the group composes of four (formerly five) members and those are Victoria, Amber, Luna and Krystal. Former member, Sulli departed the group in 2015. The quartet have gained popularity in as well as out of South Korea and have performed in the USA and Japan. The group have released four full length albums, two extended plays, one re-packaged album, one Korean physical single and one Physical Japanese single, since they made their debut in 2009, with the single, "Chocolate Love".
The group are known for the experimental, electro-pop music. Their fan name which was finally chosen in 2016, is ME U.