As I said, Ah xin will appear whenever our FL is in danger or mess (our FL's name is different for every world). She can't remember the memories of other worlds she transmigrated, but she knows that the FL is special for her. Ah Xin may look indifferent or emotionless, yet her actions are so romantic, and she shows how much she cares for the FL. Also, She won't know that she likes the FL unless the FL confesses first (it happens in every world).

Anyways, our MC will always return to these darkness or void after their happy endings in every world, and she'll sleep for a very long time until the FL will summon her.

Ah Xin is a godly creature, and it also includes the FL (it's mtl so not sure the exact word, but they have godly powers that are beyond cultivation world). The FL is with friends with Ah Xin since she was a child, and she really thinks of Ah Xin as a good friend however, Ah Xin is in love with her ever since.

The FL was engaged with A dragon prince, but the the dragon prince wants to cancel the marriage because it likes a little bird. The FL was very embarassed because she's a golden crow princess. Then, (okay I can't explain well) the prince wants to go with the bird to the small world so the bird can love her (I guess? The bird doesn't like him so.. lol). The FL angrily followed them and promised to destroy their life (so The FL became the villaines while the prince and the bird became hero and heroine of the small world). Everytime the FL will have a bad end, the prince will get stronger, BUT OF COURSE Ah xin, to the rescue! There's a problem with the thousand realm, and it might destroy the small world where the FL resides so Ah Xin merged her body with the realm to protect the FL. She can freely control the small world because of this (she's basically a god lol she can destroy thousand of worlds in an instant).

Ah Xin will always appear to rescue the FL, but she'll forget what happened after. The FL too doesn't know anything because she'll become a brand new person in every world. Afyer several worlds, the FL regained her memories with Ah Xin in other worlds, and she always wait for Ah Xin. There are times that Ah Xin will not appear until she dies because she lived happily.

The FL realized everything after the last world and then she looked for ah Xin. She can't find Ah Xin and fell in despair. Ah Xin's voice appeared, but it seems that she can't remember the FL again. FL confessed her feelings, and she apologized for taking hundred thousands of years before she realized.

Ah xin revealed her sacrifice. She also revealed that she activated a restriction where the FL needs to confess first before she can realize her feelings. She said that she wants to feel how geeting confessed first because she loved the FL for a very long time.

They married each other after lol

In the cultivator Arc the name "Yin Lan" (not the MC) is used instead of "Yin Xin" (who is the MC) frequently, especially during scene at an inn. The entirely wrong name is also sometimes swapped. Imagine having two couples and two of the persons names got swapped around leaving me confused for a bit. Its an immersion breaker.

Got a nice twist near the end and the different world kind of is connected to each other so if you skip one, chances are you're going to miss a few clues in there that will play in next 'life'. But nothing major and it's a easy fluff read. Has a few angst moments that's just *chefs kiss + heart eyes*

Also not really a spoiler but there's another 2 souls that always follow our leads the main hero and heroine of the world's now the heroine starts turning Yuri halfway through the story due to certain events but then the author backs out around world 7 only to have a Yuri ending anyways.... Idk it pissed me off to get bamboozled then I guess author got some heat and went Yuri after all ? Welp it was unsatisfying that she went back on it then that hasty "just kidding she really is into girls" at the end, like sure I'm glad it was also Yuri but why the back and forth? Felt cheap.

Luckily the last few worlds has the MC flip to the FL, and it saves a bit of the story for me. Not much though...

The love interest for the original FL in some of the stories was hidden or killed. I dunno, it's kinda vague what's really going on there.

The meta-plot becomes a story about immortal beasts with human forms and some overarching evil plot that's resolved in two paragraphs. With Ah Xin's emotionless character I just can't bring myself to care, and you can tell that the author really wanted us to care about Ah Xin's fate, but they didn't know how to make it impactful.

There's the "unlucky child" that also travels between worlds and we're told later that she's supposed to be the original FL in every world. However the original FL in the first few worlds are cannon fodder and usually idiots. It doesn't match the character for the "unlucky child" that we're given later.