Hey there, can you help me?

I saw a manhwa/manhua/webtoon (colored) recently, but I can't remember the name.
Some info's about it:

• At the beginning of the history, the MC's worlds turn into a game that he played
• everyone acquires new classes, however the mc doesn't
• the MC goes to a place where he finds a "hero of that game" this hero has blonde hair, and he was fighting with the demon queen
• The MC follows this hero until a city but when he gets there, he destroys the defense tower
• The MC doesn't know that he's causing this.
• He also has a cat, and after sell the "hero's equipment", he joins a team to go back to his apartment (which became a dungeon) to rescue his cat (which now have powers and its OP)
• After a certain time, he finds the demon queen and he also cut off her horns to sell. The queen also now lives with him in a new mansion that he bought.

Hey Guys, never mind. I've searched every site that I saw in the last six months, and I've found.

Wo Jìng Ran Shì Zuizhong BOSS -- I Am The Last Boss