This is a sweet and interesting transmigration story. There are some inconsistencies in the storyline that makes the ending unrealistic except (see spoiler in the comments section).
Character wise:
FL is a strong and righteous General that supported the Emperor in his fight for the throne.
ML is a man FL saved early on and has been by her side ever since.
The Emperor is a ruthless and shameless man that will stop at nothing to get the throne.
Acting wise this was great. Even if the short format leaves little room for in-depth interpretations of the characters, these actors actually manage to give us more than just a one dimensional version.
So, if you love a good transmigration story and a strong FL, this is definitely well worth watching.