2AM Changmin proudly shared the results of his three-week diet in preparation for a concert.
On December 9, Changmin updated his twitter account and shared the before and after photos of his abs.
He revealed that his weight before he started his diet was was 82.4kg.
He also shared an 'after' photo, where he had slimmed down to 77.6kg and developed an impressive set of abs.
Fans were impressed and wrote comments such as:
"Oppa that's great! 3 weeks is so fast!"
"How did you slim down in just a short time?"
"Looks so sexy! Congratulations!"
"What's your secret diet?"