Case File Compendium: Bing An Ben (Novel) Vol. 8 by Rou Bao Bu Chi Rou

Now assisting the Dreambreaker task force, Xie Qingcheng has steeled himself to oppose the man who was once his lover. He has watched the long-missing He Yu triumphantly return as the head of He Pharmaceuticals, but he knows that He Yu is secretly working for the Mandela Syndicate--the shadowy organization whose machinations have underpinned every crisis he and He Yu have faced.
Xie Qingcheng knows his betrayal has broken He Yu, and he's all too ready to believe He Yu's love for him is a thing of the past. But when Xie Qingcheng finds himself trapped on the Mandela Syndicate's hidden island, he has no choice but to put his fate in He Yu's hands.