Emperor 1. Park Jaehyung as Jaerald Abraham - Soon To Be King, The first child. Married. 2. Yoon Dowoon as Dominic Abraham - Second Child. Active in Military. Have not Married. 3. You as Stella Abraham - Third Child. A princess who has to get married before his first brother got the throne. Head Of Secretary Kim Wonpil as William Trycher - Putra dari kepala sekretaris kerajaan terdahulu. Bangsawan tingkat satu. Head of Politic Strategy Kang Younghyun as Brian Emerald - Playboy. Bangsawan tingkat satu dengan kecerdasan diatas rata-rata. Head over heals for Stella. General of Military Kingdom Park Sungjin as Stephan Lincoln - Dewa Kematian di medan perang. Bangsawan tingkat lima.