She was a secondary character, each of her endings tragic. And then she came to a realization. The system she was bound to was a homeless system. It did not give any newbie package, oldie package, and completing the missions had no rewards. She decided to not do missions anymore.
System: Warning! Please complete the mission, or you will be eliminated.
Tang Guo: Dream on.
System: Host, I beg of you! Please don’t bully the main characters anymore!
Tang Guo: No way.
System: Master, how do you plan to bring disaster to this world? Take me with you!
Tang Guo: It can be done. Check that man’s information for me.
System: *chirping* Okay! Please wait a moment, master!