Cortis Seonghyeon boasting an incredible core on the stairs

Purple Seonghyeon's photo posted on Cortis's Instagram

Seonghyeon, showing off his core strength on the stairs out of the blue—he's such a cutie who is truly unpredictable!

How is that pose even possible amidst all that mischievous charm? Seonghyeon's core is amazing💪