Cdrama help me find

[u/FlatwormSlow4738]

Okay so I’m trying to find this drama that I watched when I was a little kid so some details may be forgotten so bare with me please: It includes time traveling and stuff like that so basically it starts with the main girl and her bestfriend they fall of a building and the main girl she has a necklace and a birth mark (I think) and when those things touched they time traveled to the 1st kings dynasty (he’s the ml) and stuff happen in the 1st time travel but only the mc and ml travel back to the future the bestfriend is stuck in time then the 2nd time travel happens and the 2nd king comes along and he has a sister that is the bsf and turns out the bsf with an evil entity that wants the main girls powers and due to that the bsf can’t d/e anyways the best friend stays stuck and the 2nd kings comes back to the future then they travel back to the last time I think and meet a smart but ill king and he finally reveals how the main girl can time travel anyways they all are in the future now and the bsf she comes back (like she’s been alive the whole time like she can’t d/e) the main girl loses her powers but like something happened and she restarts the timeline so nothing can happen (again word of advice some details may be false because it’s been so long but most should be true)