Speaking of Maro ....he was a real person . It states in the Samguk Sagi that Maro's mother Hae Ap sent her son Maro who was a great spearman to join the army of King Dae Musin Mu-hyul . Most of the characters in this drama were real people so that makes a change. BTW the name Goguryeo was not used until the time of Muhyul's grandson Taeso . During Muhyul's time the state was known as North Buyeo.
Thats great but consideing Muhyul was only 39 when he died he sure aged a lot . Muhyul was another of these Alexander The Great types a young military genius he commanded the army at age 13 killed Daeso and subjugated Buyeo ,Gaya by age 15 ,became King at 19 than took on the Han Dynasty . Incidently the Muhyul /Yeon tragic love story would replay it self through several generations of Goguryeon Kings starting with Hodong all the way to Anseung (22nd king)so it looks like we have a lot of material to be filmed .