Well people say that when you meet your doppelgänger, the fake one dies and the original one gets to live. So I would either die or kill it without doing anything
There is an interesting story about this on Webtoon. It's part of the Friday Forbidden tales: https://www.webtoons.com/en/thriller/friday/ep-24-doppelganger1/viewer?title_no=388&episode......
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