@Nanaao I completely forget about that dude. As you say, there is high possibility of this person is prince's brother. That is how plot twist work, because nobody expecting him at this moment.
.
Omegaverse >ω< https://mangamirror.com/manga-list/106967
.
Historical BL ♛➛ https://mangamirror.com/manga-list/122136
.
Best stories ⛧⁀ https://mangamirror.com/manga-list/106911