Almost all K-Pop fans have had that moment of doing a double-take on some of Korea's best idols when they first made their debut... "Wait, doesn't he look just like [fill in the blank]?"

We've compiled some of the most talked-about doppelgangers in this article, including Super Junior-M's Henry, Girls' Generation's Yoona, Big Bang's Daesung, and EXO's Kai.

Which other K-pop stars bear a striking resemblance to these idols?

Henry, who recently made his solo debut with "Trap," has been mentioned by many fans that say he bears a similar resemblance to JJ Project's JB and rookie singer Roh Ji-Hoon.

Since all three of them have relatively small yet fierce eyes, a high nose, and round lips, it's no wonder that fans would confuse the three! Not to mention that Henry, JB, and Roh Ji-Hoon have had the same hairstyle, and their face shapes are also similar.

JJ Project's JB made his debut as an actor in "Dream High 2," and joined Jr. to form a duo called JJ Project. Their first song "Bounce" garnered much interest among fans.

Roh Ji-Hoon first gained attention as a contestant from MBC "Birth of a Great Star," and he released his debut song "Punishment" at the end of last year.

As the three of them look so similar, can you tell who's who in the pictures?

Another trio that has often been confused due to their resemblance is none other than Yoona, Seohyun, and Yuri in Girls' Generation.

As the three have a similar image and are all beautiful members of the girl group, fans of Girls' Generation probably spent quite a while distinguishing between them when they first debuted!

Yoona, Seohyun, and Yuri, who heard that many Japanese fans often confuse the three of them, even recorded a video to address their similarity. The Girls' Generation triplets exclaimed, "We're different!"

Big Bang's Daesung and solo singer K.Will have also been said to look very much alike. On an episode of SBS "Night After Night," the two appeared on the show and even Daesung admitted, "We really do look a lot like each other."

Daesung joked as he spoke about K.Will, saying "It feels like I am looking at my future self when I see him...Can you please remove the mirror? It's confusing me!"

EXO's Kai has also been known to look like SHINee's Taemin. Not only do their nose and lips look similar, Kai and Taemin both have amazing dance skills.

Kai is currently promoting with the rest of EXO with their title song, "Wolf," and Taemin has been appearing on "We Got Married" with virtual wife, Naeun.

What do you think? Do you know of any other K-pop idol doppelgangers?