Yep, previous chaps show Hallita sliced Doha's neck, but that's obviously when she was possessed by the dead ex-wife. I mean, she was hearing voices y'all!
Hallita was full of regret for her dead family and comrades that she became an easy target for the vengeful spirit. Given that Hallita's ghost shows her so young, I would even go as far as assume that the dead wife's spirit lived out the rest of Hallita's life for her after completing her mission of killing/taking revenge on Doha. Hell hath no fury like a woman scorned after all.
I hope for Doha and Hallita to find peace by finally understanding and accepting what truly happened, and I hope that will also result to Junoh being able to regain his body and live in peace.
Finally, I so pray that the live action/Kdrama persists, so more people will be able to discover this wonderful webtoon because it deserves all the love!