I Stepped on a Bug, and the System Says I Slayed a Dragon?

"Ding! Congratulations to the host for killing a Beast King above your level. Rewarding a tenfold amplification: Acquired an Immortal Body and sixty years of cultivation base!" Listening to the system prompt in his mind, Qin Yang stared at the large cockroach he had just stomped to death, looking completely bewildered. "Alert! A Beast Emperor-level Star Beast has been detected! Host, please flee immediately, or you will be torn to pieces!" Qin Yang looked at the tiny purple spider in front of him, a giant question mark hanging over his head—You call this thing a Beast Emperor? Later, inside the library, Qin Yang was reading a book when a little girl walked in. "Ding! The aura of a Female Emperor has been detected. Host, please kowtow and acknowledge her as your master immediately for a limitless future!" Qin Yang looked at the innocent young girl earnestly reading her book, his expression turning stiff. There is seriously something wrong with this system!!！