I thought that at first as well. But if you look at her calendar the next day was marked 1000. So I believe it…
He said a thousand times, which means her returning back to the mountain was the thousand times but she has no idea. and maybe the writer wants to confuse us a bit by making her meet the detective the next day. in my own understanding
Lee Jae Wook is about to show how it's done! Y'all watched his script reading clip? Amazing! https://twitter.com/leejaewookstyle/status/1725296899501220229?t=tZKHqNOZRorFmXJYOEjrrQ&s=19