at the end of episode 10 in CLOY the main character from Secretly Greatly named Bang Dong Gyu is featured. If anyone wants more on his background then watch his own movie.

both leads are "twins" in TCC he isn't related and is more of a doppelganger someone they find that look a lot like the king, where as in QLAW they were actual siblings.

both male MCs are very similar in this aspect only because none of them have any idea how to rule. in Flower Crew the king was born of royal blood while in TCC he is only a replacement.

FC he was raised as a commoner while in TCC he is of a much lower class.

basically the same plot only in The Crowned Clown the King requests a look-a-like and an Eunuch stumbles upon Clown Ha Seon.

Eternal love a.k.a Ten Miles Of Peach Blossoms, is the first story in the series,if you liked the first one then why not watch the after story.
All contain CGI

if you like the whole series in general then why not watch the after story.
both have CGI.
both are by the same director.

both involve Twins, the younger sibling replaces the the older siblings position in High School King of Savvy.

In Your Honor the younger twin ends up working in place of older twin "accidentally".

both will make you laugh, and cry.

"The Journey of Flower" has a female lead who is born with specific (blood) illness/disease and "Fighter of the Destiny has the male lead born with a specific (blood) illness/disease, has CGI, weak to strong, and fantasy which is your typical wuxia dramas.

it's kinda similar to this drama but that's only with the whole two different world things I recommend reading some reviews.
The drama is about a girl named Claire Duncan who is absolutely addicted to watching her all time favorite Korean Drama "Taste of Love" and wishes she could live in a world exactly like that, when suddenly she finds herself in the so called "DRAMAWORLD" where she meets another facilitator by the name of Seth Ko who's a waiter in which you think wouldn't hurt a fly but is he really all he seems to be?