If the doctor tells the male protagonist the truth: You only have your head alive, if you didn't do scientific experiments for me, you would have died, and I would send you to a parallel world and implant another body, you will be reborn, and then you will pass through the parallel world. The repetition of death travels through 2 worlds, finds the criminals for me, and by doing these you are edifying yourself and saving the people of this world where you have died.
If you were the male lead, would you perform the mission? Of course not, for the world where he has died, the reward is to continue the vitality of brain cells and continue to perform tasks. It is not worthwhile to take the initiative to die repeatedly. Life is too meaningless, because he is actually dead in this world. The male protagonist can choose to live in a parallel world instead of choosing to die in the real world. As long as you don't die, you won't come back. If you die in reality, you will be in a parallel world forever. Therefore, life and death in a parallel world is lived by the male protagonist himself, not by the doctor. The doctor didn't lie to him that the male protagonist went to the parallel world to enjoy life. That doesn't help the real world at all.
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