Many viewers are already raving about Netflix's newest mystery/thriller series, 'A Killer Paradox', starring Choi Woo Sik and Son Suk Goo.

While the thrilling story and the immersive performance of the lead cast was enough to create significant buzz around the series, another interesting element from the series has also gone viral. 

Viewers were actually struck by how closely Son Suk Goo and his younger counterpart resembled each other!

Netizens commented, "Okay is that not his son???", "Did they use AI??", "Where do they find these actors kekekeke", "I'd believe it if they said that was his younger brother", "I bet the director was literally applauding the moment he walked into the audition", "Great, I'm still the only person in the world without a time machine", "It really looks like AI to me", "This is so crazy", and more.

But there's more. Another younger child actor was cast to play an even younger version of Son Suk Goo's character, and this time, viewers couldn't believe how the child actor appeared nearly identical to Son Suk Goo as captured in his own childhood photos. (The second photo below is the real Son Suk Goo.)

Meanwhile, 'A Killer Paradox', which premiered on February 9, tells the story of a university student named Lee Tang (Choi Woo Sik) who accidentally murders a man one day. The next day, he finds out that the man he murdered was in fact, a serial killer. While Tang continues killing vicious criminals, a cop named Jang Nan Gam (Son Suk Goo) investigates his case.