I don't get it.
2007 + 14 = 2021?
SNSD debuted in August, 2007.
In August, 2008, they would've celebrated their 1st anniversary as a group (2007+1)
In August, 2017, they had their tenth anniversary as a group (2007+10)
So this August would be their 14th anniversary, by all logic.
Or what am I missing?
People think the Korean age system applies to this.