Recommendations

Bienvenido a juegos mentales.
Si buscas una ambientación escolar y un misterio por resolver este puede ser un buen drama.
Es un poco menos sangriento pero tiene una buena construcción de personajes.

Both are a kmovie about a female killer, the two worked in a violent job and ended up killing everybody. Kill BokSoon has a more complex storyline with other characters, while ballerina has an emotional thing on it.

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