Liang thought the same thing what hen said to him. Even though Eunseok previously was in love with Mio, he sacrificed his love for his sake and his sincerity is more believable than any extravagant layer coated oath. But the thing was, he still didn't love Mio even though he knew he had developed some feelings for him, he still didn't want to accept it.
He diverted their mind from this by asking Eunseok about the dome that was just destroyed. He remembered that the flare bumped to something before the blast.
Eunseok told him that the door was set by his mother and this place was a hidden spot made by her for Mio, so he could hide from the emperor. After saying this his face turned pale. He stood up and said "Quickly! we have to get Mio out of here before it's too late!!!".
Spy got back to castle and report to the emperor. The emperor was busy staring a portrait when the spy came and reported him about everything on how is Mio doing, how he fell in love with an angel and also told him about how Eunseok and Hunas is helping them.
After finding out that his son fell in love with an Angel and turned into a dragon as well as Eunseok who is his best friend's son is helping him makes him furious. He thinks that the angel isn't exiled from the world of angels, but instead, it's all an act to fool him and destroy the existence of the demon world. Emperor asked the spy about where were they hiding all this time. The spy tells him everything.
He was taken a back when he found out that all this was happening under his nose. He gave the bounty to the spy and send him away. Then he called his servant to call the head minister and head general for an emergency meeting.
When they both came, the Emperor told them to prepare the army to attack the angel world. Both the head minister and the head general surprised by the sudden decision. They ask the region, but the emperor says only one thing, "Mio is in danger!".
Through a portal, Eunseok takes everyone to his secret hidden place. He tells everyone that they are safe here. Then he asked Hunas to come with him. Hunas puts his kids down and ask them not to go anywhere before he comes back and stay with Liang and Mio. The kids ran towards Liang and clung to him. After that, Eunseok and Hunas went outside.
When they went outside Liang took a good look at his hiding place. Trees everywhere, the land was filled with grass and it also had a huge lake. Fireflies flying around him, but there's no way to come in and go out. He stood up and went to look for some resources. The kids also went with him.
On the other hand the Emperor goes to the place where they were hiding before. He orders his men to search for them in the whole jungle. All the soldiers, in different directions, start looking for them. Eunseok and Hunas see that the emperor was searching for them. Eunseok quickly open the portal and both of them jump in.