Transmigration: Creating a Timeline in a Parallel Universe

Yang Yangyang, an ordinary office worker, is hired by the Space-Time Administration and accidentally signs an "indenture agreement," obligating him to carry out missions for the agency for the rest of his life. From the bioplagues of [I Am Legend] to the modern fantasy of [Magic Phone], or the [Marvel Universe] of League of Legends. After a special mission, Yang Yangyang realizes that someone seems to be controlling the course of his life. Who am I? Where did I come from? Where am I going?