Kahi promised that she would visit her good friend, Mighty Mouth's Sangchu, in the army.

The singer tweeted on the 30th, "Goodbye Sangchu! You'll do fine in the army. Fighting! I'll take kimbap and go visit you. Be healthy. Haha," along with a photo of the two friends.

Sangchu's short hair also attracted attention as it was cut short for his enlistment.

Netizens who came across the photo commented, "The two look so friendly", "Kahi's the noona... But Sangchu looks like the oppa", "I hope Kahi comes back soon and Sangchu has a good army service~", and "Sangchu looks good even with short hair".

Super Junior's Leeteuk and Sangchu enlisted on the same day at the same location.