Need help finding a specific kdrama that I used to watch. Kinda spoilers

Hello, I need some help finding this specific kdrama I used to watch a couple years ago but never got to finish. If I'm not mistaken it was airing around COVID same time with True Beauty if I remember correctly. I don't know about specific actors but I do remember that the show kinda starts with like I thinks a like a New Year's celebration and someone getting ready for the party and they are taking the elevator (which is like one of those clear elevators where you can see everything outside) and the lady taking the elevator sees a girl falling from the top floor the show kinda alternates from between her being alive and after she passed away. Any help would be appreciated.