The day after I locked up the villain, the villain killed me. However, I had no control over my fate. God gave me a chance to be reborn, and I came back to life.
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I:? ? ?
Villain: Suddenly I remembered that I didn't see you today, and I was unhappy.
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The villain is just a nickname, and both protagonists seem to have that serious illness.
Intention: If you don't do it, you won't die.