So there was a secret to the name, too. That's amazing!

Soo-in (Kim Hye-yoon)'s name is written in Chinese characters as 囚人 (meaning "to confine" and "person"), conveying the meaning that she is a character trapped in Salmokji, while simultaneously being a character who is trapped by her own guilt toward her senior, Gyo-sik. Ki-tae (Lee Jong-won)'s Chinese name, 祺泰 (meaning "happy" and "great"), signifies "a person with a big heart who brings happiness when together." Director Lee Sang-min revealed, "I gave him this name hoping that Ki-tae would become someone Soo-in could lean on."