In the teaser videos, the two fromis_9 members prepare to meet their fans with an official debut, handing them a letter.
As previously reported, the 9-member girl group made their pre-debut with "Glass Shoes" after making it to the finals of Mnet's trainee survival show 'Idol School'. They'll now be making their official debut with a mini album 'To. Heart'.
'To. Heart' drops on January 24, so stay tuned!