fromis_9 have made their official debut with "To. Heart"!

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The "To. Heart" music video follows the girl group's 'school' concept as they study, clean the classroom, and have fun. 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'.

What do you think of fromis_9's debut with "To. Heart"?