Recommendations

Older woman/Younger Man romance, The female lead is strong in both. The male leads return from abroad only for the FL, both male leads love the female leads since childhood. Male lead chases the Female lead first. The side characters are supportive and funny.

Both have similar vibes about revenge though the premises are different.
Black revenge deals with scandals and in media however Fukushuu no Miboujin is setup in corporate IT Company office.
Both are good to watch.

Both have similar theme. In both the series FL has hidden identity and seek revenge.
Will update soon.

Intricate revenge plot with lots of twists plus smart ML who resembles Na Yi Je! The mind games are mind blowing and well executed.

Ice Lake
FL had the power of ice and she was powerful too.
FL became a servant of ML.
FL was surrounded by handsome men and a princess (a powerhouse).
Martial Art and arrow.
Look like ML is going to teach FL later on.
ML & FL were sworn enemies but they will eventually fall for each other cos they are the only ones who understand each other and know each other pain.

Both dramas have Yang Yang as the main male lead. His dramas usually don't disappoint so if you like his cute office vibe, maybe try watching some of him in ancient dramas.

Bad Buddy involves around college, sports, action, and the struggles to be able to like each other just like nitiman, there is a difference in the plots but i think if you liked nitiman you will probably like bad buddy.

the main character who has very beautiful visuals <3
i really like these two pairs, TayNew & BrightWin. i hope they can really become a couple in real life

Both are lighter, shorter xianxia dramas in which half or both of the main couple were/are deities and reincarnate but reunite in their new life/lives. In both dramas there is a third deity who is trying to drive them apart and destroy the ML.

Both are Japanese bls with a high schooler main lead.
(spoiler for both shows) In both shows, one of the main leads confesses in the first episode.
Kamisama no Ekohiiki is a must-watch for all Japanese bl lovers!

Not really any similarities but in MSCL, Minato is "hiding" his feelings and in Utsukushii Kare, they both hide the fact that they like each other for a pretty long time.
They're both really enjoyable and fun! (if you know how to enjoy a show)

Both are short length mini dramas in which a modern day actress FL ends up in a historical game like setting in which she has a guide who helps her/gives her tasks to complete, and falls in love with the royal ML who is supposed to die in the story.

Both shows have a modern day FL who ends up in a historical game like setting in which she has a guide who helps her/gives her tasks to complete.

Both have a FL from the modern day entering a game or game-like historical setting in which she must complete tasks to return home, falling in love along the way.

Both have a FL from a modern/future world who ends up in the past, and a poisoned, expected to be short lived ML who she can help/save.