The Crown Princess (2018)

Just like Never let me go is about the romance between a rich young master and his bodyguard, Crown princess is the romance between a princess and her bodyguard. Kinda like the straight version of Never let me go.

The romance in The Crown Princess is similar - with its very restrained noble love, "never step out of line before we're free to be together" vibe, but it's more extreme in the Crown Princess. Both involve court intrigue, military men, lovely costumes, and couples determined to put the whole kingdom before their own love interests. Crown Princess is a hate-to-love, but Legend is not.

FL is also a princess, who will be the crown princess later in the story.
ML is a soldier and bodyguard to FL, who will protect her all the way.
The main differences are that SJJ is a period drama and its characters have some supernatural power as far as its aired episodes.

both FL is third in succession line of crown heir by default but their capability and ML support made her right candidate to be crown . both ML have army background and here it comes the dilemma for ML and FL , love or duty . one more love story unveil between situation of royalty and common