they become friends in the odd eye realm and escape together into the forest on earth! they're the first friends LVRB!yeojin makes that doesn't treat her like a younger sister, especially since she has to guide them on earth after their fall. on the flipside, yeojin is chuuwon's first friend outside the Eden Academy so they become important to each other in navigating the world. i would say they're a trio that can share everything with each other and just like to relax after the horrors of trying to escape the forest. they can have fun later.

I'll briefly explain LVRB chuuwon! chuu embodies unrequited romantic love, and her journey is essentially finding herself outside the context of romance and embracing platonic love. she's read too much shoujo and perfect romances in Eden, so she has to become whole through grappling with the reality of that. she's still very loving, but more healthy and realistic at the end. gowon learns to reach out (she's a loner and prefers it that way. VS ohye who is an involuntary loner) and realises her impact on others (butterfly effect). she has a good understanding of herself, but not in the context of her environment. she's naturally detached and while she learns that's ok, she learns her impact can be positive and extends it to collapse the mobius strip.

the trio like to have book dates where they swap genres or watch drama... and since yves and ohye's relationship is tense, chuuwon hangs out more with the individual 1/3 members. especially yeojin

[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.

[LVRB] i'll answer for yeojin since haseul and birdseul info is coming soon 🔜 yeojin (last year in highschool) and haseul (in university) r sisters and haseul is essentially her main caregiver and they live together in the town. think woomanna LOL. yeojin's story is about growing up and being independent, especially when she ends up being lost in the borders Odd Eye realm (a forest) for a long time, just before graduation.

she's spunky and loud, the most younger sister ever. haseul and the 1/3 track team's goal is to find her, dealing with self-acceptance and personal turmoil along the way. throughout the story, yeojin is someone choerry (the protag) tries to find when she's not swamped with OEC duties. however she finds out later than 1/3 because... busy and she drifts apart. yeojin becomes good friends with chuu and gowon, helping her escape the forest once she finishes her arc and reuniting with 1/3 and choerry. the sillies... she's chuu and gowon's (and eventually olivia hye's) main guide to Earth as yves is busy and can't guide for shit.