Recommendations

While UMWA is fully reincarnation, DNA hints at a situation like this. There is a supernatural temple in DNA where a couple attempted to go out Romeo and Juliet style but one of them survived (so the urban legend goes.) Amber and Le investigate this but the main plot is not about them being reincarnated, while it is in UMWA. As an added bonus, DNA has great cinematography and music! Definitely worth your time :)

Both are about a historical ML who time travels to modern day, meets and falls in love with the FL. Both have the modern day characters filming a historical drama as part of the plot.

Historical ML time travels to present day and meets modern day FL.
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Very different in tone and length, but both are about a historical ML connected to the palace and a present day FL who meet due to time travel.

Similar feel and tone, featuring a time traveling character between historical and present day with a historical ML and modern day FL falling in love.

Short length series about a time traveling lead who falls in love with a historical royal.
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Both are short dramas in which a historical ML time travels to the present day and meets/falls in love with the FL.

It's a Philippine adaptation of the original. Hope you can give it a try if you've watched the original.

The story of LuZhen closely resembles that of Yanxi Palace because both FLs started as a palace servants and climbed their way to the top using their skills. Both FLs are smart and able to stand up for themselves.

Ruen Rak Ruen Tard is similar to Nang Tard because of the female lead who happens to be a slave in the time of Rama V.

Poisonous Passion is similar to Kluen Cheewit because the drama is around the story of the main lead actress who hides a painful past behind her strong, famous and successful appearance. There a kind of vengeful flame from the male lead to the female lead who finally end up loving each other and living together.

Poisonous Passion is similar to Raeng Ngao because of the "Internal Death" and back to revenge side of the female lead, the twin sister in Raeng Ngao and herself inside a new identity for Poisonous Passion, using her appearance to seduce and revenge the man who used to hurt her in the past.

Both dramas have realistic writing about the public servant experience (civic police officers in Ordinary Greatness and firefighters in Tears on Fire). Includes sometimes unreasonable community members who they serve, the stress from family members about their profession, and teamwork and support from their coworkers.

Same Actors: Zhao Lusi and Leo Wu

In Love Like The Galaxy, the two main leads are Zhao Lusi and Leo Wu, while the main leads in The Long Ballad are Leo Wu and Dilraba Dilmurat, and although Zhao Lusi is not the main lead in The Long Ballad, both actors have previously played in a drama together that aired not so long ago.

In both dramas, the female leads have scheming relatives from which the female leads have to protect themselves.