The group recently started teasing for their comeback with codes, followed by a comeback. They've now also uploaded an intriguing video via Instagram, consisting of an incomprehensible electronic sound. Two more photos of indecipherable numbers accompanied the clip. 

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Check out SF9's puzzling teasers and watch out for their full release on April 18!

#SF9 #BreakingSensation

A post shared by SF9 (@sf9official) on Apr 7, 2017 at 5:00am PDT

#SF9 #BreakingSensation

A post shared by SF9 (@sf9official) on Apr 7, 2017 at 5:00am PDT

#SF9 #BreakingSensation

A post shared by SF9 (@sf9official) on Apr 7, 2017 at 5:01am PDT