What if he didnt died ?...what if the program harvey deleted was something that kept he on the simulation?...and he just needed a few minutes to awake...i know this seems farfetch but......
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I also hope for an ending like that. That Harvey just escaped from the simulation, far away from Eun-mi, and that he is still alive somewhere. When you look at what he does on the last day, it's not the simulation program he deletes, but the PC system he erases. He destroys Eun-mi's ability to harm him.