| Seo-Yeon lives in the present and Young-Sook lives in the past | One phone call connects the two, and their lives are changed irrevocably |
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| Cast , , , , | Seo-Yeon lives in the present and Young-Sook lives in the past |
Seo-Yeon lives in the present and Young-Sook lives in the past.
24| Two people live in different times | The post credits scene reveals old Young-sook had called her younger self to warn her she might die, however, she couldn't make the call from the future if she had died in the past |
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| Seo-yeon hangs up thinking the woman has the wrong number, but later learns that the call was coming from the same house 20 years ago |
One phone call connects the two, and their lives are changed irrevocably.