She was a slender girl of short stature with blond hair and similar eyes as Soo-Won's. When she was young woman she wore a light colored gown with earrings that look like flowers. As she grew older, after moving into Hiryuu Castle, she started to wear more royal robes.
Eventually after getting ill and moving to another residence, she started wearing plain white robes and wore her hair in a side ponytail.
Yong-Hi was very polite and hardworking. Yu-Hon also noted her to be stubborn despite her looks.
However, Yong-Hi was also rather avoidant, reserved, and self-critical of herself and her clan's purpose in the world. She often did not take action, blamed herself for the mistakes of her generation, and was, for the majority of her life, struggling with depression as her family and friends died one by one.
As a descendant of Hiryuu, Yong-Hi lived her early childhood and adulthood in an isolated village with all the other descendants. Half of her clan was inflicted by the Crimson Illness, and her father eventually succumbed to this illness.
Yong-Hi's clan protected their blood through generations, considering it a gift from God despite their short lifespans. But Yong-Hi wonders what will come good of society with it, and thinks there is only a point if the 4 Dragons appear.
Yong-Hi's father said that the Crimson Illness was something put in place by the Dragon Gods to summon King Hiryuu back to the Heavens, and gave Yong-Hi a journal she would write her experiences and life story in, one day to be discovered by her niece and reincarnation of Hiryuu, Yona.
Yong-Hi's clan protected their blood, considering it a gift from King Hiryuu despite the fact that the villagers would die at young ages.
Yu-Hon was Yong-Hi’s husband. They met during King Junam's reign after she was attacked by his pet hawk which he had to rescue her from, and he took her to Kuuto by his horse to treat her sprained ankle. Initially, Yong-Hi finds Yu-Hon rather loud and overbearing, but she comes to take a liking to him after learning about how much his brother meant to him. After their first meeting, they began meeting near outside her clan's grounds every 7 days, and over the course of months, Yu-Hon and Yong-Hi fell in love.
After her mother banned Yong-Hi from meeting Yu-Hon again to preserve their clan's secrets, Yong-Hi vowed to not meet Yu-Hon again. However, Yu-Hon continued to wait for Yong-Hi, and after reuniting after many months, Yu-Hon decided to ask Yong-Hi's mother for permission to marry, and they moved into Hiryuu Castle.
Yong-Hi was Soo-Won‘s mother, and they both seem have had a good relationship with each other until she passed away due to her illness.
Il was Yong-Hi's brother-in-law. They had a complicated relationship. Although Yong-Hi and Il were on good terms, the bad blood between Il and Yu-Hon forged a chasm between the two, and ultimately ended with the two writing their final regrets to one another.
- Yong-Hi is a Korean uni-sex name with different meanings, depending on the han-ja used to spell it. When spelled '용히' it directly translates to 'liberally'.