The Imperial Uncle is a historical-ish danmei (Chinese m/m) novel. I bought my copy new.
Review:
First: each character has multiple names, and I'm not sure which, if any, are more appropriate to use in my review. For Prince Huai/Jing Weiyi/Chengjun, I'm generally opting for Chengjun except when his title feels like a better option. For Liu Tongyi/Ransi, I'm opting for Liu Tongyi, and for Yun Yu/Suiya, I'm opting for Yun Yu.
Prince Huai, uncle to the young emperor, Qizhe, is deeply loyal but knows that his loyalty will always be doubted due to the actions and reputation of his late father. Even knowing that it could lead to his downfall, he decides to act as a spy, collecting information on conspirators against Qizhe while acting like he's going along with their uprising.
Things are coming to a head now, and the conspirators are preparing to make Chengjun the new emperor. As Chengjun works to simultaneously help Qizhe while avoiding getting caught in the trap of his own making, he finds himself pondering his relationships and future and wondering if there will ever be anyone willing to stand by his side. For a long time, Chengjun has been in love with Liu Tongyi, a virtuous official whose reputation is as spotless as Chengjun's isn't. Is it even possible for anything to come of those feelings, or would Chengjun be better off focusing on Yun Yu, the man everyone seems to already think is one of his lovers? Yun Yu is one of the conspirators against Qizhe, simultaneously Chengjun's closest friend and the person he's preparing to betray, and who may therefore lose his life during the attempted uprising. It seems as though there's nothing but loneliness and tragedy in Chengjun's future...