
ok so im mad confused but imma say what I think is happening and if I'm wrong id appreciate people correcting me soo I think the uke travels to like an au maybe every time he sleeps so he shifts between the emperor and the vice guild leader

I think it's mostly time travel (second chance in life) story, he went back in time before the war, during the time when Rowen was still a prince. In chapter 4, when Lee (Ernst) woke up beside Rowen, Lee said that Rowen looked younger. On chapter 5, Lee said that the Black Lion (the mercenary group) would become great in future wars and that he didn't know that Prince Rowen was leading them directly. Rowen's hair color is different for disguise purposes (I think), since he is a prince that leads a mercenary group. As for the flashback, I think it's just...well, flashbacks or Lee probably just dreams about his previous (future) life. Anyways....this is just what I think.
Yess my mans got drunk (=・ω・=) ahh uke x alcohol is just perfection