Scarlet Heart Ryeo : King's beloved twins princess (Wang Yo/Wang So)

Hae Soo and Hae Young were twins daughter of King Wang Taejo and Lady Oh Sohyeon. They were given the tittle as the first and second princess. Hae Soo was a first princess while Hae Young was a second princess even Hae Young older than Hae Soo. They were become King's beloved daughters. They were destiny to rule the Goryeo with their future lover.

What will be their fate? Can they handle together?