You Were Supposed to Go to Jail, So How Did You Become Invincible?

Question: What should I do if I inexplicably find two corpses in my house and get forcibly detained? Luckily, not long after he was locked up, Jiang He discovered that as long as he stayed in prison, he could earn upgrade points to level himself up. Simple and straightforward. You’re as fierce as a wolf or a tiger? Doesn’t matter. I’ll max out my physical stats and slide-tackle you like a college athlete. Your supernatural powers are off the charts? Doesn’t matter. I’ll max out my resistances. Try breaking through my defenses first. I can spend every day slacking off in prison while steadily growing stronger, and they provide food and lodging. Who wouldn’t love this life? What kind of monsters and demons think they can keep me from doing my time? I’ve had enough! One punch and I’ll blow up the whole world!