Heo Youngsaeng:

The Emperor. He is a kind and gentle one. He is suffering from the loss of his husband Kyujong and also sick with tuberculosis and also pregnant by Kyujong as well. He treats everyone that works for him like family. He will also see Kyujong's spirit from time to time.

Kim Kyu Jong:

He is the deaseced husband of Youngsaeng. He died in battle, fighting for his kingdom. When he was alive he was also very kind and gentle as well. Since he passed, he has been keeping a eye on Youngsaeng.

Kim Hyunjoong, Park Jungmin, and Kim Hyungjoon: they are the imperial guards.  Who protect him and are like his brothers.

Baekhyun, xiumin, Luhan and EXO:

They are his most trusted warriors, they are very kind but can be a bit protective.

Taehyung, jin, yoongi, jungkook and BTS:

They are the retainers, also known as personal confidence people that hang out with royalty.