Do you know how old Itzy Yuna was during debut?(in Korea)

Ok this is for science! How well kpop fans know her age!

Quote from tetetete

15?

15 is correct international age, but not in Korea.

In Korean you are 1 year old since you born and once the year change you become two year old, so if you born 31 December, after 1st January you are already two years old in Korea while being one day old internationally. That's why Yuna was 17 years old during debut. Surprisingly only one person beside me pick the correct answer.