Recommendations

Both series are historical. They have a strong focus on the customs and daily life of the noble families during the time period. The main female lead is also intelligent and headstrong.

Body switching between parent and child, where it is between father and son in Tamiou, it's mother and daughter in this case.

Both are epic wuxia movies where a group of male and female assassins try to take down the emperor.

Differences is that one is set in Korea and one in China.

Both productions have similar premise - terminally ill women decide to travel (either by pilgrimaging or road-tripping)

It's almost exactly the same. The vibe is somehow similar to each other. If you love Deep in my Heart. Try Meloholic too.You might like it.

Both have dark and intense plot... gruesome to the point that they can make you cringe, Both are about catching a psychopath.

Both drama's tackle issues of the FL not understanding love, and being confused whether the ML's advances are romantically or sexually charged. The FL in both dramas are played by the same actress Morikawa Aoi, and the ML in Kakafukaka is the 2ndML in Bungaku Shojo. They aren't too similar in regards to the type of drama though, Kakafukaka is much more quirky and odd (and has more of a sexual theme), where as Bungaku is more conventional.

Same female Lead
Elements of fantasy
Political drama
Some comedy but is a melodrama
Writing is better in my opinion

Both movies have breathtaking cinematography and unique non-linear plot where past and present mix together

Both movies feature quirky male leads that travel across desert regions of China because of crimes someone else committed

Following the LOONA girls, more similar to LOONA TV but with Go Won's spin on the short reality show

Both productions have similar premise - girls cross-dressing as boys to become a dancer (or a singer) for one reason or another

Both Chinese dramas are about a person who changes sex on kissing. In rules of love, Luo Tian who has identified himself as a boy becomes a girl on kissing the ML while in Only Kiss without love, female Tong Tong becomes a man on kissing a mammal.

They both have very similar vibes and Park Min Young plays nearly identical characters in both. If you're looking for cliche rom-coms to make your heart flutter, you're gonna dig them.

Both showcase healthy relationships between the leads and deal with their emotions in a very subtle and sensitive manner. They are both rooted in reality and deal with prevalent issues without being preachy or boring. It's definitely refreshing to see male leads respecting their partners and giving them their space. They are both slow romances, Radiant office more so but that's part of what makes it so gratifying at the end. They are not your typical K dramas and are hence grossly underrated. They are not for everyone but they're definitely worth your time.