Group Infinite's Sungjong showed off his cute charm.

Today, Sungjong posted on his Twitter, "Boo" along with a picture.

In the picture, Sungjong is in a casual outfit, sticking his lips out at the camera. He added pink cheek stains with camera effects on his phone.

Internet users who saw this commented, "So cute," "Youngest member Sungjong," and "So different from on stage."

Photo Credit: Sungjong Twitter