Lifehacker reader Gabriel Wyner was tasked with learning four languages in the past few years for his career as an opera singer, and in the process landed on "a pretty damn good method for language learning that you can do in limited amounts of spare time." Here's the four-step method that you can use, too (and you don't have to invest hundreds in a language course like Rosetta Stone).
"Korean alphabet. For over a millennium, Korean was written with adapted Chinese characters called hanja, complemented by phonetic systems like hyangchal, gugyeol, and idu. In the 15th century, a national writing system called hangul was commissioned by Sejong the Great, but it only came into widespread use in the 20th century, because of the yangban aristocracy's preference for hanja."