Pioggia di Cenere (2019)

Both movies deal around a natural catastrophe that set the world into chaos. In both dramas the characters have to find a way to survive. The only difference is that Ashfall revolves around a volcanic eruption while The Calm Beyond focuses on tsunami due to a storm.

Both movies depict story of a disaster and struggling of people to be survived.
The Exit is mostly focused on the escape plan of a couple (not really couple) but Ashfall is more team oriented

Disaster movies starring Lee Byung Hun. One is about airplane terrorism while the other is about a volcanic eruption.

They both show the DPRK and ROK people working together to save the peninsula (in totally different ways).

Both movies portray a disaster in a city and struggling people to be survived.
Both movies benefit form great actors and scenario as well as eye catching special effects.

Same Natural Disaster and Survival . This film involves a volcanic eruption, where characters must navigate through dangerous and unstable environments. The impending doom of a volcanic collapse mirrors the scenario of being on the brink of disaster on an unstable bridge.