I’m seeing people play the blame game re: Hansung’s death, so heres the truth:
Hansung died protecting Sun Woo because Dan Se was told to kill the King by his grandfather who thought that Sun Woo was the King because Young Sil sent assassins to kill Sun Woo because Sun Woo said he was King when they were in Baekje. But Sun Woo only said he was King because the Crown Prince of Baekje heard that the King was one of them, and threatened to kill Ah Ro, and because Ji Dwi wasn’t coming out, he had no choice. But the Crown Prince only knew the King was there because Ban Ryu gave him the message from Young Sil, who sent the message to confirm/kill the King who he thought was Sun Woo because Ji So was protecting him when Young Sil initially had his guard almost kill Sun Woo. But Ji So only did so to protect Ji Dwi and take the spotlight off of him, because Young Sil made it known that the King was in Hwarang. But Young Sil only knew because Sun Woo dropped the bracelet, but Sun Woo only had the bracelet because Ji Dwi dropped it. But Ji Dwi dropped it in a fight with Sun Woo who was trying to find the person who killed Mak Moon, but Mak Moon died because he saw the King’s face and he only saw the King’s face because he entered the capital to find his family. But he was only looking for his family because they were separated most likely as a result of Ji So who was in love with Ahn Ji Gong and was rejected by him and made to marry the previous King
so, to conclude, Hansung died because Ji So was forced into marriage.