Completely different genres, however there's no denying the bromance between actors Hwang Jeong Min & Baek Sung Hyun! So, if you want to see Goo Dong Baek & Han Sang Chul reunited once more (albeit in a different form) watch Blades of Blood. Brought back fond memories :-)
Similar in : interior conflict that ruined the country, usurpation by the desire of grandeur hidden under pretense of saving the people, the way of the sword chosen above anything else. Distinct filming, strong acting.