What if you woke up one day in a different era? Would you play it safe, or change the course of history?

Jang Ji Na

• Birth name: Gina, changed to Ji Na after adopted.
• 25 years old (present day)
• Born in Daegu, South Korea; raised in Incheon
• Works as a cometologist
• Adopted daughter of Jang Beom So and Hye Sun (biological parents unknown)

Do Kyung Soo

• 26 years old (Joseon era)
• Born and raised in Joseon
• Crown Prince of Joseon
• Son of King Taejo