With his ties to the banking world severed (and his reputation somewhat intact), the path is finally clear for him to return to the law firm.
In of Suits , Mike Ross does not go back to Pearson Specter as a full-time associate lawyer.
Mike’s return wasn't a simple career choice; it was born out of a series of professional and personal failures:
At the end of Season 3, Mike decides to leave the law firm to protect it from the risk of his secret (that he never attended law school) being exposed. He takes a job as an investment banker at the Sidwell Investment Group, which makes him a client of Harvey’s. 2. Conflict and Rivalry does mike go back to pearson specter in season 4
Mike’s return is complicated by his employment contract with Sidwell Investment Group. He cannot simply quit; he is financially entangled with his boss, Jonathan Sidwell, and a billionaire investor named Charles Forstman (played by Eric Roberts).
Mike's return to the firm is a moment of celebration for fans, but it sets a timer for the show's biggest crisis. By returning to Pearson Specter, Mike puts himself back in the crosshairs of the legal community.
When Season 4 begins, Mike Ross is no longer a lawyer. Following the events of Season 3, he has taken a job as an investment banker at a boutique firm, working with Jonathan Sidwell. This move was originally a strategic play to help save Pearson Specter from a hostile takeover by Logan Sanders. With his ties to the banking world severed
Here is a full write-up detailing how and why Mike goes back to Pearson Specter in Season 4.
However, his return is not immediate, nor is it a simple case of him walking back into the associate's bullpen. His re-employment is the central conflict of the season's latter half and serves as the catalyst for the show's next major turning point.
So, in short:
Harvey pushes for Mike's return to protect him from working for Forstman. Ultimately, Louis Litt is the one who convinces Jessica Pearson to rehire Mike, largely to cover up his own illegal dealings with Forstman. Season 4 - Mike back and Pearson Specter
This decision directly leads to the cliffhanger of Season 4. While working a case involving a high-profile attorney named Travis Tanner, Mike makes an enemy of the District Attorney. In the season finale, Mike is arrested for conspiracy to commit fraud.