Transmigration in an Online Game as the Rotten Protagonist

[The world is explained in detail, with even some useless features written down.]

A man known as Joel lost an enormous amount of money on investments. He was about to win 400 million dollars in a game but failed. He went mad.

Then, a notification from the company rang on his phone with a proposal of 10 billion dollars if he completed a new version of the game, and that opened the way for a new playthrough and he was transmigrated into the game as Malvoid, the Rotten character.

[My vocabulary and grammar are not the best... you may find broken sentences and others]