Thanks for the overview! I saw Old Boy years ago, as well as Train to Busan recently, and yeah... both were quite wild rides. However, I was touched perhaps even more by a film called Chi-buro (The way home) - it is neither an action film nor a horror, but more of a poetic memory of childhood and one amazing grandmother living in the countryside. The film is a bit slow, but full of both delightful, funny, and emotionally devastating moments of almost universal value.