Recommendations

The relationship with a "dead" person kinda reminds me of Something in my room. The characters personality and dynamic are also pretty similar, the quiet and calm guy with the guy who is all the time after him. The sad and angst feelings, both with tragedy plot and the passionate romance between the leads is a good complement of both series.

Same visuals in joseon era
There is an alchemy of souls also with two personalities who inhabit the body of the lead hand
The costumes are similar
Several romances and stories of crossed revenge

The main lead has 2 identities
The visuals are similar
The hand lead has a trauma
There is a story of revenge

Same demonic atmosphere

The actor has a song kang vibes

The guy chases the demons but the presence of them make the drama similar

Personagens com histórias correlatas. Poderes de extrema força, transmitido pela linhagem, pelas as mulheres as suas filhas

Both drama mix real life and a fiction world
In EY there are characters who are in a comic and doesn’t realise
In both drama it is necesary to change the course of events.

Both dramas are set in Republican era.
Both Fl get into de ML family looking for revenge
Both are mini dramas.
Both couple have a good chemistry (I think the chemistry is little hot in The Captive)

Both are set in same period, Republican era.
Both female lead look for revenge and don´t trust ML at first.

Trhuth or Dare is also a period drama with crossed brides, althoug has less palace intrigues.

Basicamente este é a segunda vida/ reencarnação/ oportunidade ( como quiser chamar) deles ficarem juntos.
Seria melhor ver primeiro maid's revenge para não ficar com um sabor amargo. Até porque em sequencia seria essa a ordem.. Contudo maids revenge tem uma carga bem mais pesada. O protagonista masculino é bem mais "assertivo" e possessivo, também é passado noutra epoca... Forever love é mais doce de uma forma mais suave.

Romance com pegada mais dramática.
Final feliz e conclusivo, atuações boas, conversas mais densas e reflexivas.

Due to the intricate police plot, the cases are not what they seem and what is behind them is not known until the truth is revealed. By protagonists of absorbing complexity. Both series/dramas deserve to be taken into account.
Spanish:
Por la intrincada trama policial, los casos no son lo que parece y lo que hay detrás no te lo esperas hasta que la verdad queda revelada. Por unos protagonistas de complejidad absorbente. Ambas series/dramas merecen ser tenidos en cuenta.

Se você gosta do aespa e quer uma série bem sitcom dos anos 80 ou em geral antigas,essa série é pra você

Both use poetry and symbolism to further the storytelling.
Both explore the melancholy and regrets of the MCs. The way both movies are shot gave me the same calm but also shattering atmosphere around the MCs.
Both portray LGBTQ+ relationships.
Moonlit Winter also depicts the MC’s relationship with her family.

The format is different (one is a movie, the other is a drama), but I found SLSYT pretty similar to My Mister in some ways. They both use beautiful symbolism to add to the story.

Both are centered on the MC’s introspection and explore through them regrets that pile up in one’s life and the inner self you never let out all this time. The desire to become somebody else or to disappear out of self-hatred is one of the main themes of both stories.

SLSYT shows the journey of one character, My Mister the meeting of two characters at the lowest point of their life.

The two stories are filled with melancholy and just as Shim Hee Sub in SLSYT, Lee Sun Kyun and Lee Ji Eun/IU portray it in a compelling way.
They both depict the MCs' relationship with their family.