I KNEW IT. I had this theory, cause Soowon has this ginger hair. Its like the washed down version of Yona's crimson hair. Which means Soowon has a stronger blood connection of king hiryuu than all the other descendants, however, Yona is rather the Reincarnation of king hiryuu therefore she has the same soul as king hiryuu, which means automatic crimson hair.
Moreover King il has always forbidden soowon from going down to the shrine in the castle and there MUST be a reason. Which we could conclude from this chapter that something in that shrine could awaken soowon's lineage 😗😗
ALSO! i dont get why you guys want soowon to die??? He is hot! But also his character has so much depth to him. In my opinion, soowon is a very good king. He tries his best for his country and betrayed two people he loved the most for the country. Moreover soowon has a kind heart, you can see that when he stopped waging the war after seeing the princess from that other country (forgot the arc name) but yeah.