Actors I think look similar

Yeo JIn Goo is twins with Kim Min jae with just a bit more weight in his face

Park Eun Bin & Lee Re favor each other ironically Lee Re played the younger version of Eun Bin In a drama before

Bo Young reminds me of Ji Hyo I can't quite put my finger on why. They aren't exactly twins but I think it's their head shape and mannerisms and the fact that their both tiny lol

Lim Yoon A and Song Ji Hyo are actually twins Yoon A is the taller younger sister

Hwang Min Hyun and Cha Eun woo are twins Eun woo just has a sharper jaw. Hwang Min Hyun also looks a lot like Lee Know from stray kids

its not often I do it but it wouldn't be hard to mistake Jin Sun Kyu and Im Chul Soo if you aren't too familiar with them

After I watched a bit of Backstreet rookie Ahn Sol Bin popped up on screen and I immediately thought it was Lee Hye Ri I had to double look

Seo Hyun and Claudia Kim both beautiful both look a like I thought they were legit sisters