 The group released their comeback song "I'm Sorry I'm A Noona" in January 2011, with the song being about a woman who laments the fact that the younger man she's interested in only sees her as a "noona", or older sister.In February 2011, the group announced that they would be heading to Japan as enka singers (enka is a similar style of music to Korean trot).The statement read, "They've received love calls from three major Japanese distribution companies, which we are looking over now.