I think Alan exists, but when he was occupied, I don't think it was the last trial, but after he was caught in jail, before he met Martin for the first time, Alan waited because of fear The reason "disappeared" (Loy also mentioned Allen helplessly begging him for help at the time of the crime).
The next step is Roy, who was upgraded to the main character, in order to survive, disguised as "Alan", the original main character, and then took the opportunity to show the existence of "Roy". In this way, the "innocent master Glenn" can be exonerated, because the crime was committed by the "secondary Gloy". But in fact, when Martin first met him, the main character was already Lowy.
Rationale: A lot of people talk about the fact that Lowe can't be obedient enough to let the bishop play with this, and I agree. Also, when Roy was playing Alan, he said he would lose time, have amnesia, and didn't know Roy's existence. I think this was a lie that Roy lied to make "Alan" innocent. Because in the conversations that Roy talked to Martin as his own personality, he could learn that he knew a lot of information about Allen, and also mentioned that Allen asked him for help, proving that the two personalities can communicate and even have memories. Based on this, it can be inferred that Lowy is lying to let his "Allen" play away from the case and the murderer (if it was the weak original protagonist, Gu Allen, he would not have told such a lie). A person who doesn't know he has a split personality and a person who knows he has a split personality and knows what the sub-personality does, Loy certainly chose to play the more innocent former.
So, I think what Lowy said at the end: "No Allen, only Lowy" should be "In the trial process of this case, there is no Allen, only Lowy".
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