Evie Totty: “It ruled.”
Not to be confused with the 2013 film of the same name Gwoemul (original title) is by Korean director Joon-ho Bong and currently available for free on Amazon Video.
I found out about this film via press from his upcoming film Snowpiercer starring (among others - it has several well-known American actors) Chris Evans (aka Captain America).
It's listed as a horror film so I expected something along the lines of The Ring or The Grudge. I was pleasantly surprised as this is more like a live-action Anime. I squealed with joy more than once as I recognized the familiar tropes - including a family making a huge scene in a gym housing memorials for the victims. And then people coming up and filming. And then them asking 'Why are you taking pictures?' You have to see it to understand.
Here's the description from IMDB:
"A monster emerges from Seoul's Han River and focuses its attention on attacking people. One victim's loving family does what it can to rescue her from its clutches."
It's a touching story: a family's struggle to save it's youngest member in the midst of a 'world event' while dealing with government interference and heartbreak.
I highly suggest checking this film out.