I, the Delivery Boy, Became a Martial Artist by Sending Bad Reviews.

An optimistic deliveryman was accidentally bound to the "negative review system". As long as he completed the negative review orders from all over the world, he would be able to receive heaven-defying rewards. From then on, in the crisis-ridden dungeon world, he relied on "sending negative reviews" to make funny upgrades, win the beauty back, and finally reveal the story of the hypocritical mask of the main god space.