Same nang'ek and pra'ek in both drama's. They have good chemistry together and I recommend this drama because of plot. ?

Similar themes. Female leads saves the world in the end for revenge. If you want to watch a drama with a female lead who isn't so naive, Princess Agents is recommended. Though both endings were not satisfying, but at least Princess Agents plot had more development.
Warning: That drama is also as twisted and graphic as this one.

This drama is similar because of the Time Travel, romance, comedy, and Historical time period. Both also involve politics.