When i first read that this comic is similar to akatsuki no yona i was a bit afraid but later i realized that my fear was unfounded.
The premise is indeed the same.
The king is killed from a family memeber who then takes the throne while the princess runs away and gets on an interessting journey.
This really showed me how irrelevant the premise is.
Yona is a pice of garbage while this one is one of the best adventures i know.
Its like you have two writers, a smart one and a retard and you tell both of them to write a story about a strong female princess who flees and perhaps will take her country back.
In AnY the princess is a dumb spoiled brat who is described as strong but in reality is just the "choosen" one and so on.
In Song of the long march we actually have a strong female lead who isnt only described as such but really acts in this manner.

The artstyle is also great, it is mellow and elegant.
The beautiful artstyle was really the reason i started SotlM

of course its not perfect, for example the speed in which li gets the trust of new people is really unrealistic
its also not believable that noone notices that shes not a guy
only because she wears her hair different


but i like that we see what she does in warfare
in other anime or manga its often not shown, only statet
take code geass, we dont see a real military decision by lelouch we are just beeing told that he is a genius and won and that he is got in chess