Both contain great friendships, stress-free relationship, FL helping the ML overcome a personal issue, and lots of cute and funny scenes. They’re both also written by the same author.

the male lead is the female lead’s body guard and they fall in love with each other. the female lead is domineering and the male lead is submissive.

both movies involve the main character(s) having to surpass a large amount of people in order to escape. the difference is squid games involves games & the goal is money whereas battle royale is purely fighting to the death with the goal of being the last one alive in order to escape.

both couples stay true to each other and always communicate with each other. they help each other solve problems & mysteries. really enjoyed both dramas :)