Something's Wrong with the Secret Guard

Shen Du woke up and found himself in a strange room, disheveled, with a strange and beautiful man lying next to him - and it seemed that this man had just had some kind of indescribable relationship with him. Shen Du's inner OS: Holy shit? Damn it? What is going on? Am I not working overtime? Did I travel through time after my sudden death? If you want to time travel, just go back in time. Why is the opening scene the scene afterwards? Who is this man? What did I do to him? What did he do to me?