In simple ways there’s 3 timelines. In first time line ML lee sayoung dies so euijae use the watch to turn back time. Then in second time line euijae dies and lee sayoung use the watch to turn back time BUT the watch can only be used once so it being used for second time creating the 3rd timeline it gets messy bcs now both 1st time line and second time line is emerging with each other! Now in final time line with both 1st and 2nd timeline lowkey coexisting they have to fix it and survive kinda thing lol hopefully this explains it in easier way!
In simple ways there’s 3 timelines. In first time line ML lee sayoung dies so euijae use the watch to turn back time. Then in second time line euijae dies and lee sayoung use the watch to turn back time BUT the watch can only be used once so it being used for second time creating the 3rd timeline it gets messy bcs now both 1st time line and second time line is emerging with each other! Now in final time line with both 1st and 2nd timeline lowkey coexisting they have to fix it and survive kinda thing lol hopefully this explains it in easier way!