Jeon So Mi and HyunA recently surprised fans with an unexpected display of affection.

On August 9, a surprise unfolded when HyunA posted a photo and a short video on her Instagram. The photo and video featured Jeon So Mi along with a message of support from HyunA. HyunA wrote, "So Mi congrats. Eat well and show everything that you prepared."

In the video, Jeon So Mi says, "This is a video," and then is seen giving HyunA kisses on the cheek when HyunA suddenly turns her head for a kiss on the mouth. After the kiss, Jeon So Mi gives out a squeal of laughter.

Online users quickly flocked to Instagram to leave comments such as "What's going on?" "What's their relationship?" "They're so close but this is a whole new level," and "This is going to create quite a buzz."

Meanwhile, Jeon So Mi made a comeback and unveiled her latest EP 'GAME PLAN' on August 7.