The model for Munsu was the historical figure Park Mun-su, from Korea's Joseon Dynasty period. According to Youn, he was originally a military officer in charge of training the army, and was active as an amen osa for only one year. However, his legacy was considerable, including not only seeking and punishing corrupt officials, but also stopping the invasion of the Korean peninsula by foreigners and saving the king from a "coup d'état". Sando is based largely on Ju Non-gae, a figure from the Japanese-Korean Seven-Year War. Following the capture of Hanyang (now Seoul) by Toyotomi Hideyoshi's troops in 1592, Non-gae avenged the death of her lover, a soldier, by willingly giving up her life to cause the death of a Japanese general. The holiday Uiambeolje commemorates her spirit of patriotic self-sacrifice.