Responses
The 'life' is probably just a translation error, think of it as her ghost existence or something.
And the reason she stayed might have been her brother but she still has a wish of traveling the world. What she said was she'll pass on after she's fulfilled her last wish
I immediately said "Thats ironic" when I read what she said lmao but really I also thought her goodbye was before her soul was purified
Amy: "Thank you for avenging me, Ill never forget it for the rest of my life"
Me: "The rest of your... 'life'...?" Girl, you're making me confused...
Seriously though, I'm a bit sad because I thought her goodbyes meant Amy was moving on in order to get reincarnated or sth (this is an Asian work so there's probably "old style" reincarnation for ghosts, isn't there?) ... as in, get reincarnated as a baby with a new chance and... stop being a ghost? She's free of all pending regrets so... why the heck is she still stuck as a ghost?? If solving their regrets doesn't allow them to reincarnate, how long are people stuck in that state?? It's starting to sound scaryyy???