super heavy spoilers ahead:
??? but the main story ending was that the one who possessed the og daughter was defeated tho? what op posted was basically what happened in the first timeline. penelope got killed and the one who possessed the og daughter was basically free to do whatever she wanted and the only one who could kill her was penelope but she was dead. that was why everyone else died. (the magician dude being trapped in the mirror forever also happened in the first tl) the sides stories were not an alternate ending, if anything it continued what happened after the main story. like how penelope was finally and archeologist with the support of callisto (even tho tbh he really wanted to marry her already and was basically about to give up being an emperor just so he could stay by her side as she does archeological stuff), how she found eclise in one of those archeological digs or whatever, how they freed the magician guy, etc.
No. The side stories is basically the continuation of the main story. There are those infomation that we didn't have a chance to see in main stories and you can read it in side story e.g what happen to iklise, to the magician (forgot his name) what happen to mc in her past timeline and about their daughter.
this about sums it up.
So i kinda want to spoil you.(Korean Forum)
WARNING: Tragic SPOILER! I Warned you!
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I know this is dissapointing but as said by the author, the ending is tragic, like the title, all of them would suffer a consequences, Iklies will die, The Magician dude, will suffer from a life curse, and all of them really meet such a bad ending.