One viral online post with side-by-side photos of actor Lee Kwang Soo over the years has gotten the netizens buzzing with arguments and plastic surgery discussion.

The post, originally shared on theqoo, noted that the shape of the actor's eyebrow appeared quite different.

Older photos were contrasted with newer ones, noting that his brows are darker and less arched nowadays.

The uploader indicated that this minute change had an impact on how people perceive his appearance.

It soon came down to whether or not a simple brow change could bring about such a dramatic change. Some internet users even speculated that cosmetic surgery was used.

Another onlooker asked, "I wonder if he got braces."

Another provided a more positive comment, saying, "Not a huge change... But he looks really handsome, more polished."

Others aimed at his nose, one of them crying out, "It's the nose that changed, guys. The shape of the nostrils is totally different. LOL."

Another added, "Changed in a way that'll have a good impact on his work. Good.".

Speculation continued with a fleeting claim, "Nose job."

Another did the same, inserting, "Looks like his nose changed..."

Others stated that they did not notice much of a difference. One of them commented, "Wow, I don't have an eye for detail at all. Besides the eyebrows, nothing is visible. Haha."

Another of them stated, "Appears his nose got lower...

One of the commenters was amazed by other people's keen observations and posted, "People who can notice things like this are incredible."

Others saw the change, nonetheless, as being more about styling rather than surgery, with brow grooming playing the key role.

One of them praised the result, saying, "Looks way better. If the color were just a bit lighter, it'd be even nicer."

Another commented that the new look made him resemble another actor, stating, "I initially thought it was Song Seung Heon. Eyebrows play an important role, it fits him well."

A fan attributed the change to a new episode, stating, "Aha!!! That's why he looked especially handsome in the latest Pinggyego episode."

Another pointed out sharper images, adding, "Oh, his features are so much sharper now. Amazing how just eyebrows can make things that way."

Some liked his earlier look. One commented, "I liked the earlier look."

Another attributed his haircut, saying, "I think showing his forehead makes a big difference too."

Some gave mixed comments. In one, the author stated, "Looks good close up, but far away it looks a bit heavy, LOL. Still, feels like a good change."

Another emphasized natural features, writing, "Eyebrows make such a big impact. Probably stopped thinning them out since he has thick brows, and changing the shape gave his overall impression a big shift."

Finally, another commenter caught another detail, saying, "His eye sockets look deeper too... That also has big effect."

The argument goes on in cyberspace, with netizens and fans alike opining whether Lee's make-over is the result of plastic surgery or the magic of subtle styling adjustments.