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In page Daemusin of Goguryeo:

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King Muhyul was given the title Daemusin wang, which literally means "Great Holy Warrior King". As with most Goguryeo kings, little is known about Muhyul except for what is stated in some ancient Korean sources. Some historians have inferred that the giving of such an extreme title to this man must mean that he led Goguryeo through many outstanding military accomplishments, possibly more than he is given credit for in historical texts. Another school of thought declares that the destruction of East Buyeo in itself, was an almost unthinkable feat at the time, meaning East Buyeo was a powerful kingdom according to these select scholars.