The main male lead of {I Swear to You} - Nickname: En - Grand Duke of Laphieon - Lost his parents due to the betrayal of vassals in the past - Harbors personal feelings for Floren, who was the only one on his side at that time - Cold and blunt - Follows whatever Floren says - Speaks softly to Floren - Uses informal speech with most people, but formal speech with Floren ex) Have you arrived? It has been a long time. I missed you, etc. - Affection for Floren: 100 (out of 100) - Affection for Liren: 79 (thinks she is a kind person after meeting her once in the past)

The sub-male lead of {I Swear to You} - Nickname: Loui - Crown Prince - Won the struggle for the throne by killing his own family members - Harbors personal feelings for Liren, who was the only one to comfort him when he was in despair due to deep guilt - Sly and occasionally cold - Childhood friend of Floren - Speaks softly only to Liren - Uses informal speech with everyone ex) You're here, I missed you, let's go together, etc. ex) Bring it out immediately, you insolent brat, etc. - Affection for Floren: 83 (due to strong possessiveness...) - Affection for Liren: 100