fromis_9 have released the highlight medley for their debut album 'To. Heart'!

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Fans can finally get a sneak peek at the songs on 'To. Heart', including the girl group's title track of the same name. 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'.

fromis_9's debut mini album 'To. Heart' drops on January 24. Which song do you like best so far?