Does anyone know why Onmi closed so abruptly?

I loved their naengmyeon and had made a reservation to try their soy sauce-marinated crab. But today, both Yelp and Google Maps listed them as temporarily closed, and when we got there, there was a permanent closure notice on the door.

It seemed to happen out of nowhere, and I haven’t been able to find any explanation. Does anyone know what happened? I’m really going to miss this place!