The Host (2006)

Similiarity unexpected threat and survival. The Hosteatures a mutated creature attacking Seoul, causing chaos and isolation. The sudden appearance of an unknown threat that forces characters to fight for survival is similar to the unexpected dangers lurking in the thick fog.

A very strong family bond
Unearthly creatures are created due to a mutation
Children fighting for themselves

You'll love this if you liked The Host!

Creatures create havoc, in Deranged it's a parasite. Both are centered in water creatures. Thriller, suspense

If you like suspensful horror movies, then these movies are the perfect pick for you next holiday. Both will have you breathless and tense in front of your screen, with some emotional moments to cry your eyes out.
Train to Busan is a really good movie, the cast and crew did an awesome job at it and the musics immerse you in this fearful universe. + Gong Yoo is awesome.
The Host is a thrilling yet warm movie about family relationships and how far people are ready to go for their loved ones. + Bae Doo Na is really lovable.