[LVRB] here's a basic event timeline of the trio!!
1. (human) vivi finds (pre-OEC) jinsoul in the basement of a mad scientist in HK. she saves her and the 2 become sisters // yves goes through the horrors and falls to earth
[heejin tends to restart the loop at around this time]
2. they lived with each other briefly until jinsoul moves to dorm accommodations to be more independent. at this time jinsoul finds OEC and vivi and yves meet at the roller rink
3. vivi and yves hit it off and jinsoul is jealous bc she feels like vivi cares less for her now (she doesn't) jinsoul and yves know of each other but jinsoul has one-sided beef with her
4. olivia hye falls and seeks out to get revenge on yves by targeting her girlfriend (vivi) - figures she needs to enlist help and after stalking she finds out jinsoul doesn't like vivi and has the best chance to work with Ohye and get close enough to k/ll (LOONAVERSE LORE) vivi. she feeds jinsoul's doubt and hubris, and manipulates her into disliking vivi as well
5. at the aquarium. jinsoul goes and does the job. but in her post-k/ll moment of clarity she realises she fucked up and k/lled her sister whom she loves. she panics and rebuilds her into an android to atone, she gives her pink hair and deer modifications bc she knows her sister loved deers and always wanted pink hair. and jinsoul replaces her memory of yves to convince Ohye that this is more torturous for yves ; and erases memories of herself (jinsoul), because she feels that she doesn't deserve to be in Vivi's life anymore after this
6. android vivi wakes up in the aquarium the next day, thinking she just woke up with all her past memories rewritten. she goes back home. goes about her day. jinsoul's emotions regarding this are so strong that it replaces the memories of everyone that came from earth (aka not OEC and yyxy)
7. yves goes through the horrors again when android vivi doesnt know her, and tries to find ohye who she thinks did it. "i didnt lay a hand on her" Ohye would say, and she's right ultimately.
8. Jinsoul lives with utter guilt and Choerry can tell, she just doesnt know what it is. Yves goes on to find out what happens while trying to get Vivi to fall again. she doesnt connect that it was Jinsoul because she thought they had just drifted away. and of course Jinsoul isn't saying anything to her. Vivi soon finds out something is horribly wrong one day, and works with Hyunjin (and later Yves) to figure it out
[Heejin would normally loop the timeline back at this point. however since Jinsoul is an OEC user, vivi remains and android. subsequent loops, heejin keeps her mouth shut to keep her simulacrum peaceful. but she knows Vivi has changed.]
also! when vivi gets rebuilt into an android. everyone, including her, knows something is wrong (like the uncanny valley feeling) but can't quite figure what.