This week’s episodes mark a turning point in Jang Yeong Shil’s life, as he is brought to Hanyang by Lee Chun. Lee appears to be yet another antagonist to Jang Yeong Shil in the beginning, but when Jang Yeong Shil saved him after being left to die by the revolting peasants as well as hearing his interesting theories about astronomy, Lee decides to get Jang Yeong Shil into the Almanac Office as a slave.
The Ming China merchant who is Jang Yeong Shil’s friend made an appearance and tells him that he’s secured a place for him and the slave friend Seok-gyu to Ming China. Jang Yeong Shil and Seok-gyu are happy that they can finally say bye to their lives as slaves, but Jang Yeong Shil eventually faces the dilemma of going to Ming China or stay in Joseon, as he gets reacquainted with Princess Sohyun as well as being introduced to Grand Prince Chung Nyeong (future King Sejong).
Jang Yeong Shil finds out the secret behind the stone carving of constellations, which puts him in danger, as he is overheard by one of the officials involved in the revolt against the Joseon monarchy, when he asked another lower ranking official some questions regarding the different name of a particular constellation. A letter in that constellation is changed, which the rebel officials decided to make use of it to justify that the Wang monarchs of Goryeo are the true owners of the Korean Peninsula. It turns out that all of these was orchestrated by King Taejong, as he plans to weed out those planning to rebel and rebuild Goryeo.
We also get to see more of Jang Hee Je (Lee Ji Hoon), and right now his behavior towards Jang Yeong Shil is still kind of ambiguous. He seems to respect the talents Jang Yeong Shil has, and doesn’t seem to be as antagonizing as he was in childhood, but I’m not too sure, as he was rather unfriendly when they were still in Dong-ryae even in adulthood. Jang Hee Je appeared to be part of the revolting gang, but it turns out at the end of Episode 6 that he is actually a double spy and his allegiance is with King Taejong.
I think we’re shifting gears more to the political games King Taejong plays to solidify the monarch’s power before handing the throne over to Grand Prince Chung Nyeong, rather than focusing on Jang Yeong Shil’s inquisitive mind about Nature. That doesn’t mean we’ll be seeing only the boring court politics, as we do still have scenes of Jang Yeong Shil pondering over why days get gradually shorter, and diligently marking the shadow of a stick at noon every day. It is only a matter of time that we see both him and King Sejong crack their heads together to come up with inventions that will benefit the people of Joseon.