HaSeul (or LOOÃÂ ÃÂ & HaSeul) is the third single album from the pre-debut project of Loona, a South Korean girl group. It was released on December 15, 2016, by Blockberry Creative and distributed by CJ E&M. It introduces member HaSeul and contains two tracks, her solo "Let Me In", and a Christmas collaboration song between her, HeeJin, and HyunJin, titled "The Carol". Music videos for both songs were released simultaneously on December 15.