The bond between the '91-line idols is still going strong!

On February 24, former KARA member Nicole took to her personal Instagram account to share an image of her and former SISTAR member Soyou hanging out with 2AM's Jinwoon on the evening of his 'wait!!' solo concert. In the image, Nicole is seen smiling and offering a 'v-sign' for the camera as Soyou reaches up to playfully run her hand over Jinwoon's hair, which was freshly buzzed for his upcoming military enlistment.

"Return safely, my friend," Nicole captioned the image.

Later, Soyou posted another set of images from the meeting, quoting the first few lyrics to "The Private's Letter," a popular military-themed song by late singer-songwriter Kim Gwang Seok, which is often listened to in the days leading up to enlistment.

Meanwhile, Jinwoon's current agency Mystic Entertainment previously confirmed the idol will be entering the military on March 4, where he will perform in the military band.

Check out Nicole and Soyou's Instagram posts below!