That day, they were filming the earthquake scenes.
It's impossible for an earthquake to happen now, and it's not feasible to shoot a real earthquake scene here. For the safety of the actors, most of it relies on camera shaking, then combining the actors' performances and later simulating and creating special effects to complete.
But some specific storylines still need to be shot on site, so part of the scene is also set up on location.
The storyline includes a part with rain. Unlike earthquakes, which can use post-production effects, the rain part has to be filmed for real.
The weather in this mountain region is extremely dry this season, making it impossible for rain to occur.
The crew spent a large sum of money to rent a few sprinklers for this.
Earthquake scenes are already difficult to film, and adding rain makes it even harder.
Those actors are not used to enduring such hardships.
