YoonA is being accused of undergoing cosmetic procedures.

On March 24, YoonA guested on SBS' 'My Ugly Duckling.' Following the broadcast, netizens claimed YoonA's facial features seemed unnatural and accused the star of undergoing cosmetic procedures.

Comments stated, "Plastic Generation," "I was so surprised. Her muscles couldn't move," "She always underwent cosmetic surgery. It just seemed worse that day because the procedures didn't settle down completely yet," "She got work done on her eyes and filler on forehead, nose, and cheeks," "Her forehead is so bad TT She's already so gorgeous without any... It's unfortunate."

Meanwhile, some are defending YoonA, claiming the lighting made her features look a bit different than usual. 

Check out the video from the episode below. What are your thoughts on YoonA's 'changed' features?