O Nó do Amor: O Primeiro Amor de Sua Excelência (2018)

Both have got heroes from another planet .And have stayed behind for a reason.Both dramas have excellent comedy and romance.

The male lead in this drama waits a thousand years for his lover to be reincarnated. She is cursed to die young because of the mark she bares.

Both dramas follow the main couples love through many lives.
The male lead in both shows are in a position where they hold a lot of mystical power, and the female in the current lifetime the TV show is set in doesn't remember her past with the male lead.
All in all both dramas are very similar.

not similar in term of era and concept the only similarity is one of the main lead is cure for other

The male lead in this drama waits a thousand years for his lover to be reincarnated. She is cursed to die young because of the mark she bares.

The main lead is thousand years old and the girl is young and naive.
Nonhumans live among people.
Same comedy feel, funny bromances.

Both involved intespecies romance where the male lead who is half human and half wolf/naga (snake) creatures aging for thousand years.
The female lead is the first and only love of female lead who is carrying a curse made her to be died because of him and reincarnated as a new human being doctor/reporter forgetting her old self.
The male lead is observing the female lead from her birthday and protecting her from all the dangers surrounding her.
The female lead is not familiar with male lead in the first and always being affraid from him as he is approaching her strangely but couldn't reveal his true identity to her to not reject him.
The assistant of male lead from the same species of him, always jealous of the female lead and he didn't give any feelings to his assistant.
The female lead is mutually loving the male lead with many encounters and accepting him being immortal creature at the end.

-Both consists deities from another realm.
-In both, deities come to the female lead and falls in love with them.
-In both, female lead are miserable and suffers with misfortune.

- male fox
- living centuries to meet his one lover
- good angst in love story
- good side characters

The ML is from another planet and has lived for thousands of years searching for their long lost love. The FL is a re-incarnation of their lover in modern times and is completely oblivious to this fact.

both the male leads are antique dealers or dealers in ancient artefacts. nice, cool romance story. both have an underlying supernatural element to them. both females have a curse or similar to a curse on them that the male lead wants to break.

Both have an alien male protagonist in love with the reincarnation of a past lover. Both modern fantasy romances. The Love Knot is has a little more tragic ending but both still executed this type of genre pretty decently.

both the drama have situation FL is cure for ML disease
love not have slow pace emotional romance
yunxi have cold man cheerful girl which caught you

Both of these dramas follow a romance between a human and supernatural being. They handle a mix of comedy and seriousness while portraying a story with deeper meaning than just romance. They are also both based off of novels, as most chinese dramas are.

Very similar vibe, especially with the supernatural elements...although the relationship dynamic is somewhat different.