Origin of Hangul
Ledyard holds that the Koreans adopted five core consonant letters from ’Phags-pa, namely ㄱ "g" , ㄷ "d" , ㅂ "b" , ㅈ "j" , and ㄹ "l" . These were the consonants basic to Chinese phonology, rather than the graphically simplest letters (ㄱ "g" , ㄴ "n" , ㅁ "m" , and ㅅ "s" ) taken as the starting point by the "Haerye." A sixth letter, the null initial ㅇ, was invented by Sejong. The rest of the consonants were developed through featural derivation from these six, essentially as described in the "Haerye"; a resemblance to speech organs was an additional motivating factor in selecting the shapes of both the basic letters and their derivatives.
Memoirs of Lady Hyegyeong
By the time Lady Hyegyong had begun writing in the late 1700s, the invention of hangul had already become the voice of female narratives, which began to appear and allowed female narratives to become more and more plentiful. Haboush determines this increase to be correlated with the decrease of yangban women's inheritance rights. As family structures began to change, women turned to the pen “to bear public witness to history” and express for themselves how customs and family structures were changing at the time. Similarly, by writing her own autobiographical memoirs, Lady Hyegyong was able to express for herself insights into life at the Joseon Court during an extraordinary time.