-both have zombies
-both are korean dramas
-both of them but characters that are stuck in a building
-both include losing your loved ones

-both have zombies
-both might have a connection together because in one scene they said something about train to busan
- both are people trying to survive
-both have people trying to protect others
-both have that one character that tries to get everyone killed and only things for themselves and is selfish!

Both have the concept of playing seemingly-innocent games but not instead are killing games
also multiple people are involved in the game. It's like a challenge if you lose you die and there is no going back either.