River Where the Moon Rises: 1x19

The Princess in Crisis/Adan Fortress

Go Geon comes back to Goguryeo as an envoy of Silla. As the palace of Pyeongyang is in a state of unrest with his presence, King Yeongyang thinks deeply of what to do with him. Meanwhile, On Dal lives lonely in the mountains until he hears some unexpected news. Not knowing the true intentions that Go Geon holds, the tension within Pyeongyang palace thickens.