The Letter from the Cloud

Both dramas have a FL pretending to be a man, in a non-cute more believable way.
In Dominion and Devotion the FL is the emperor, she then takes on a concubine, but the eunuch is the ML.
In The Letter from the Cloud the FL marries to the SFL, but they have their MLs as well.

Both dramas have a FL pretending to be a man. They're scholars with calm personality. They then get married and treat their wives in a very gentlemanly way.
In The Letter from the Cloud, both the wife and the husband are the FLs, and they have their MLs as well.
In The Cross-Dressed Union the wife is the ML who is also cross-dressing.

Both dramas have FLs who lost their families and grew up to be resilient. They're outgoing, bold and confident. Also, both have medical background and a childhood connection with ML.

Both dramas have sismance with the same actress. In The Glory, she is FL's bodyguard, in The Letter from the Cloud she's a cross-dressing scholar, who has a fake marriage with FL.

Similarities:
- Strong & Smart ML + FL has some medical skill (not annoying)
- ML is a prince
- The leads have good chemistry + help each other throughout the journey
- Good storyline
- Have some investigation…Finding out the truth about the past

Similarities:
- Strong & Smart ML (great fighting scenes) + FL is quite skilled and not annoying
- ML is a prince and both had some problems with their eyes
- The leads have good chemistry + help each other throughout the journey
- Good storyline that makes sense
- Have some investigation…Righting the wrong of FL’s family
- ML & FL met when they were young and saved him/her from danger

Diff:
- MH has more cases and investigation elements
- FL in MH has more martial art + investigation skills vs FL in TLFTC can protect herself + good medical skills

Similarities:
- ML is from a powerful family…Very arrogant & Not afraid of anyone
- Both ML has great martial art skills + good fighting scene
- FL family experienced past tragedy that the leads are trying to right the wrong
- They went from bickering to lover…ML did many things to protect FL
- Good & intriguing storyline
- Has some investigation

Although one is Chinese and the other one is Korean, both have good storyline and some similarities
- Both ML are prince…Strong, smart and did many things to protect FL
- Some gender bender…female dressing as a man
- FL family was wrongfully accused so they have to hide their identity
- Make you want to root for their love

- Strong and powerful ML | Smart FL - Both help each other in solving the issues in the series
- ML & FL have a bickering relationship at first but then learn to love each other as the series progresses
- They save each other when they were younger
- Strong bond between sisters

Both dramas have two couples, with one of the FLs pretending to be a man. In Wrong Carriage, Right Groom, FLs marry each other's fiances. In The Letter from the Cloud, FLs have a fake marriage with each other.

Both FLs are the daughter of a man wrongfully accused and executed, and both assume a false identity and become swept up into some pretense regarding gender (marriage to a girl pretending to be a boy vs. attending school disguised as a boy).