It wasn't for me at all
Know there are a few characters I enjoyed which made me stick with it hoping to pick up but it never did, it plummeted down. Hyun us has saved me a couple of times. The story of being an orphaned teenager that don't interact with others, made me wonder how he would cope. Then turning into a monster making everyone fearful of him but he was way too submissive
Eun Yoo is the one that changed the most from a ballet girl to a leader I found it hard to understand the dramatic transformation at times
The brother that I got confused with the doctor or was it priest? Either way, his leadership saved all their lives. You want to stick with him when the world ends.