The System Has Rebelled and Is Collaborating with Me!

[System + relaxed and funny + cool writing + unserious...] There are hundreds of millions of ways this system is different, and it actually teaches me how to do things! "Ding!" "Congratulations to the master for successfully accepting the novice mission "I Have a Mental Illness"!" "The mission reward is unknown. If you fail the mission, you will die!" The system is changing to try to kill me. "Warning! Warning! It has been detected that the master is doing something stupid and has been forcibly terminated!" The system is not serious, and the protagonist is not a good person. He is really not a family, and he will not enter the same family! Will I be invincible if I have a system? Or perish? Who cares? That's it!