2016 was a great year for IOI, and it looks like they'll be starting off 2017 with a bang as well!

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IOI's upcoming solo concert 'Time Slip - IOI' officially sold out on the same day tickets went on sale on December 9. Tickets for their shows on January 20, 21, and 22 next year at Jangchung Gymnasium, where IOI made their official debut, are now gone. 

The project group will be ending their promotions with the concert, which has been reported to be IOI's last time with fans before their disbandment.