In this, the second episode, we get more back story on the drama's main characters. (I already hate Minister Kwak.)

Watch Lee Je Hoon bring the tragic true story of Crown Prince Sado to life in historical drama Secret Door

And how pathetic am I that I teared up drawing panel #5? These are cartoon people, and I still have sympathy for them. 

If you missed episode One, it's available at this link.