Hero: Nothing Achieved at the Age of Thirty at the Beginning

I am thirty, have accomplished nothing, and have even committed some crimes. Being betrayed and separated from my family, I wanted to change my ways, but no one was willing to give me a chance. Until I met the Earth Hero Agency. There is no system here, there are just plug-ins that brothers sacrificed their lives for. The lives of six brothers saved my life and at the same time gave me an opportunity to peep into the truth. I'm just a hero. In a different world where spiritual energy is revived, many indescribable monsters wake up at the same time. Heroes are just gatekeepers of an era. A profession that may not lead to success even if it costs one's life. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.