Idols who enlisted before their debut?

Idea for this thread inspired by daniel-cruz

Any other idol out there who enlisted before debut outside of KB from OnlyOneOf ? KB is 29 and OnlyOneOf debuted 2 years ago so depending on how long he used to be a trainee before he enlisted anything between the age of 20 and 26 (no dates given so I just guess)

So do you have anyone in your mind who enlisted before their debut? (if possible than not someone who debuted 30+)

Quote from selfmate

AKMU's Lee Chan Hyuk enlisted in 2017 at the ripe old age of 21ish lol

He didn't enlisted before debut, so pls stop comenting when you are unable to rerad the threads

Quote from selfmate

oops my bad lol

EDIT: reading comprehension isn't my specialty i guess