Yes, I think their last thought or feeling before turning becomes their sole driving force as zombie, aside from the desire to feed. However, I have my doubts with hoping CheongSan is alive. If he is, why didn't he show up to meet them.
Namra probably teamed up with other mutants to kill any remaining zombie. It's pretty corny if they went this way I must say. Besides, she would still need to feed so I wonder how she solved that.
The most crucial part for any potential season2 I believe is when they retrieve the Science Teacher's wife and son. They are technically the Patient zero. Also we didn't know what happened to JaeJun and the bullied girl.