Recommendations

Both titles are about pure unadulterated love for tap dancing.

Socialization is a 1-hour-long drama special set in current time. Main characters are university students.

Swing Kids is a feature movie set in korean war. Main characters are prisoners of war.

I watched this movie before & it is a bit similar to this movie. The FL is not popular & have a low self esteem somehow she attract the ML. As usual slowly they become close & they realized that they love each other. If you were a shojo manga fans you should watch this movie.

A bit similar story. The ML protect the FL from bullying & slowly they start to become friends. After some time passed they realized that they love each other. If you are a shojo manga fans you should try to watch it. It was not too bad as some people said. Some scene is cute & make your heart skipped.

different plot but both positive, (fantastic is also sad at times because of cancer subject, but same time funny), realistic dramas with real characters and relationships.

also, very similar love triangles which becomes lovely bromance - (spoilers:) when I watched HCCC I thought that I've never seen triangle like this with rival men with so healthy relationship, respect and becoming friends, but then I saw same in Fantastic, even sweeter bromance which started after love triangle. In both dramas SML is very good guy who can see when his feelings are unrequited (though in both dramas FL first liked him) and move on, like it would be in real life and healthy relationships, he can be real friend with FL and ML too and ML very much likes him, they form soo lovely bromance.

in rattan the FL has supernatural powers and the ML is an ordinary guy
The FL saves the ML on the brink of death

Both are about monsters/immortal beings. Bulgasal is more action/drama focused with a much darker overall tone whereas a korean odyssey is more fluffy but still touches on subjects such as death and the ups and downs when mortals meet with immortals.

not very much similar, but both dramas have very healthy positive and funny vibe (though Fantastic touches very negative subject and has sad parts it still manages to be positive drama), realistic relationships and characters, multi characters and still quite 3d all of them, without unrealistic villains (though Fantastic has very pad people as one family but still realistic ones), primitive cliches, healing...
there are no annoying love triangles, I mean it is in both drama but very healthy when SML and FL are reall good friends without broken hearts.

both are really good dramas, with one look not some new or extraordinary plot but really good watch, dramas that enjoy you (and I's saying it when 80% dramas are boring for me after 5-6 episode)

Both are about Huo Yuanjia a legendary chinese martial artist that made a big impact in China. Both have similar fight scenes like the wrestling/boxing match and vs the Japanese. Both have famous martial artists starring as Huo Yuanjia. Fearless has Jet Li while Heroes has Vincent Zhao.

This story is about Shi Yi, a gentle pleasant and low-key but industry's top voice actress, who ran into the elegant returnee chemistry professor Zhou Sheng Chen at the airport one day. They gradually develop a mutual understanding in getting along with each other, and join hands to preserve traditional craftsmanship and overcome many storms as they decide to accompany each other for the rest of their lives...

both dramas show entertainment industry and real lives / relationships behind dramas;

both dramas show quite realistic relationships / romances (TWTTLI is more realistic, Fantastic in more entertaining and good watch), without endless misunderstandings and primitive cliches.

both dramas have high class actors.

If you have watched one of them, highly recommend the other. Love element, great acting and monsters in both

Set Play and Call Boy are both films about young male prostitutes that sleep with older women. In Set Play de ML is a minor, in Call Boy the ML is an university student. Both show explicit sex scenes.

Don't know why but i thought about this drama while watching Bulgasal.Both have monsters and strong female leads.

both has strong female lead
both has romantic affection
unexpected twists
exciting to watch, not a single second was boring so far with Bulgasal (currently airing) and till the end with Vincenzo

Similar aspects /elements between these two dramas. Bulgasal so far has less gore and has a fantasy element to it but both a have romantic relationship and I think people who liked Happiness might enjoy this one too!