Recommendations

Similar plots in the fact that both male leads have mental illnesses and are proving themselves to be more than just their limitations. The rest of the plot differs on the other hand. Good Doctor said about just that being a good and capable doctor despite mental and social "limitations" and Decoded is proving hat even though he can't at the beginning he will improve himself and show that he can be great if not better than those without his condition. I fell in love with both leads and these roles show just how great they are as actor

-two groups that initially don't like each other and have to come together
-Both leads are "leaders" of said groups
-Romance(?) between the leads, the quirky and witchy characters, and the teachers
-cute, quirky male (N and Minhyuk)
-The female leads are the same, strong and independent but know when to turn for help and want to do the right thing
-witchy female character (Hee Joo and Soo Ah)
-Teachers who try their best to support the students and their dreams
-same type of drama goes on in both like the cancellation of the goals of the combined teams and teacher complications

if you like food's, chef and cooking drama and love triangle in the mix.

Both tell a story about founding a kingdom. Moon Lovers is based on the beginning of the Goryeo dynasty while Six Flying dragons is based on the foundation of the Joseon dynasty.

Both dramas have a similar vibe to them, be it the plot or the acting. Both dramas will make you smile and cry a lot. The music & cinematography in both dramas is also superb.

Both movies tells the story between the King of Qin and his assassin. Hero is more artistic, where The Emperor and the assassin is nearer at the historical story

You will see a different Zhao Li ying here. There will be a lot of ZLY and ofcourse her amazing drama skills. Of all the ZLY dramas I've watched this one is my favorite next to Journey of Flower.

Say that You Love Me loosely follows the basic story of Itazura Na Kiss, however it's different too.

Elder brother revenging for younger sibling by kidnapping the nang'ek to deserted island. But only to find out that he revenging at the wrong person later.

Ok, these are clearly nothing alike. But after watching SHR, I wanted something with a questionably crazy male lead. Yoo Jung reminded me of Wang So because neither are the typical "jerks," but they are not really nice guys either and they both make me wonder if either is really sane lol. And they kind of treat the girl the same way.
And both have the same combination of romance with a bit of suspence and an open ending.

they give off the same vibe. the two main girls remind me of each other. the two main guys are jerks to the girl the majority of the drama.

Athena is a spin off from Iris. They are very similar with a different cast and a slightly different story. The action, suspense and romance are as amazing as in Iris.

both are based on crime-romance novels by ding mo. have the same feel.

they are both based on novels by the same author (ding mo). both crime/detective and romance series.

Both talks about someone forgetting about the memories they have with their friends.
In the movie "One Week Friends" it talks about a girl who can't remember the memories that she had with her friends, and in "Forget Me Not", it talks about a girl who everyone can't remember of the memories pass with her and who she is

Something about 1 Percent is a remake of 1% of anything. I think the earlier version is quite charming.