Main plot (highlights):
At the beginning of the story, the protagonist Renn, as a lowly male favorite, was rewarded to the cruel duchess and suffered humiliation. During a near-death punishment, he accidentally awakened the [Infinite Absorption] system, which can absorb the attributes and talents of any living being. He killed a demonized hound in the Duke's Palace, absorbed [primary power] and [acute sense of smell] for the first time, and started a counterattack.
The system forcibly dragged him into an infinite world called "Void Trial". The first trial world was the "Cursed Mine". By absorbing the attributes of Goblins and Cave Trolls, his strength skyrocketed and he gained [Night Vision] and [Hardened Skin]. After returning to reality, the duchess tried to humiliate him again, but he easily killed the guards and was shocked by her absolute strength. For the first time, she felt proud and sowed the seeds of revenge.
As he entered "Elf Forest", "Ancient City of the Undead", "Dragon's Lair" and other Western fantasy-style trial worlds again and again, Renn frantically absorbed the attributes of various powerful creatures, from [Elemental Affinity], [Magic Resistance] to [Dragon Bloodline], and his strength increased exponentially. During this period, he rescued the princess Liya who was used as a sacrifice in a trial world. Liya's wisdom and tenacity attracted him, and the two became allies.
In the mid-term, Renn used the power brought back from the trial world to establish his own power in reality and launched his revenge against the duchess. Not only did he destroy her power, he also absorbed all the fighting spirit and magic talent that she was proud of, turning her into a useless person and completing a hearty slap in the face.