Munno (Actor Jeong Ho-Bin) is the Gukseon. A loyal follower of King Jinheung and one of the three students of Geochilbu. The other two students are Lady Mishil and Lord Seolwon. In the reign of King Jinheung he is in charge of the ceremony and prayers. He also investigates about astrology. Munno is known for his great swordsmanship. He received a revelation when the stars of the Big Dipper becomes eight he will go against Lady Mishil. He also protects the other twin baby Deokman by helping Sohwa escape from ChilSuk. King Jinji entrusted his son Hyeomjeong to Munno, he renamed him Bidam. He raise the child hoping that he will someday become the king of Shilla and to help him unite the Three Kingdoms (Baekje, Goguryeo and Shilla). He also planned to match Deokman to Bidam. Munno educates Bidam as a student. He taught Bidam his swordsmanship and almost all of his Technics in fighting. He was shocked when he saw Bidam killed dozens of people by trying to protect the Geography of the Three kingdoms, and from that moment he feared Bidam. Munno was killed while fighting with Bidam but it was not Bidam that killed him. It was Yeomjeong when Yeomjeong found out that Munno was trying to give the Geography of Three Kingdoms that they made to Kim Yushin. He was shot by a poison needle and eventually died. Bidam carried him on his back, but it was too late. Munno's final request to Bidam is for him to be a Hwarang and that he Officially considers Bidam as his student. Bidam never reveals Munno's death so that he will remain a legend.