Like the others said, I think she is actually a phoenix and not a "cursed eagle". I'd be surprised if she doesn't turn out to be a pheonix because there seems to be a lot of clues suggesting she is one with how her hair turned from blonde to a bright red, she has extremely powerful healing abilities, when she died she regressed back to when she was younger which is kinda similar to how a pheonix comes back to life as a young bird after death, and the eagle clan's healing abilities were said to originate from an ancient clan (which my theory is most likely the ancient clan is a phoenix clan or something like that). Also pheonixes from mythologies are said to grow stronger/more powerful after death so it also makes sense why her current powers is stronger compared to before she died.
For me I would recommend reading this manhwa as it's a pretty good read so far (really good art, decent murim plot, fights are well drawn, and flow of the story is good). The characters are not that annoying to me contrary to the comments. Also this could just be me but only thing to note is that the non old characters look younger than they are (for example the heir to the Peng Clan is 24 years old or something but when I first saw him I thought he was around 16-18 years old)
I like how despite all of his squad members are probably like 20x stronger than mc, they are pretty interested/care about him so they take the time to teach him their skills, properly listen to him (since he's the squad leader), and protects him if needed when they are out in battle together. I hope nothing bad will ever happen to his squad because I really like all of them so far.
Don't worry Ars, mom and dad will beat up the bad guys for you (╯°Д °)╯╧╧