Yes, it is but the circumstances are not. He is based on Crown Prince Sohyeon
No, I don't think so.ln this drama Lee In's brother's name is Lee Sun,right? (l didn't watch yet, but I read Synopsis) Lee Sun is King Sukjong's birth name in the history. But King Sukjong don't have brother named Lee In. So Lee In is fictional character, not Crown Prince Sohyeon.
But I'm glad he isn't King Sukjong. Sukjong became king in 1674. But in this drama it's 1640s
Lee Sun is King Sukjong's birth name in the history. But King Sukjong don't have brother named Lee In. So Lee In is fictional character, not Crown Prince Sohyeon.