I think this deserves its own post. This is an AU based on this time travel AU but instead polytrix kid Mi-Yeong going back to 1 year before canon she goes back 15 years. (Rumi and Mi-Yeong are both 10 here). Shout out to @theofficeghey for inspiring this version of the AU.
Mi-Yeong: I'm Mi-Yeong. Who are you?
Rumi: I'm Rumi. My mom's name is Mi-Yeong!
Mi-Yeong: My mom's name is Rumi!
Rumi: Do you want to play with me?
Mi-Yeong: Sure! What do you want to play?
Rumi: Have you ever sparred before?
Mi-Yeong: All the time with my eommas!
Rumi: Do you want a stick?
Mi-Yeong, pulls a sword out of honmoon: I got my own.
Rumi, pulls her sword out of the honmoon: I have one like that too!
Kimmy (thirdlight), who is visiting Celine for the first time in a decade: You didn't tell me Rumi had a sister.
Kimmy: Then who is that? She looks just like Rumi.
Celine: Hey Rumi who is your friend?
Rumi: This is Mi-Yeong! She has a sword like me!
Celine: I can see that. Mi-Yeong, darling, how did you get that?
Mi-Yeong: I used the honeymoon!
Rumi: You mean that honmoon?
Mi-Yeong: Yup that's what Eomma calls it!
Kimmy: And who is your Eomma sweetie?
Kimmy, whispering to Celine: You didn't tell me she could clone herself!
Celine, whispering back: I had no idea!
Rumi, whispering to Mi-Yeong: What's cloning?
Mi-Yeong, whispering back: I think its from Star Wars. Mommy made me watch it.
Celine: Mi-Yeong how did you get here?
Mi-Yeong: Eomma brought me with mama and mommy!
Celine: Where is your Eomma so I can go talk to her?
Mi-Yeong: I don't know, but you look like Gamma Cece but way younger!
Kimmy: Gamma Cece you say 😈
Mi-Yeong: And you look like Gamma Kimkim without the grey hair!
Kimmy: look of absolute horror
Celine: And you thought my one grey streak was bad.🤣
Rumi: Eomma can we continue playing?
Celine: Yes Rumi please be careful though.
Kimmy: Mi-Yeong fix your shir... Are those demon patterns?
Mi-Yeong: I got them from my Eomma! She always said I should be proud of them!
Celine: You two have fun ok I have to talk to Auntie Kimmy inside.
Celine: Before you say anything-
Kimmy: You really do you need my help huh.
Celine: What does that mean.
Kimmy: You obviously didn't tell Rumi to keep it in her pants.
Celine: I was going to talk to her when she was older.
Kimmy: Not this Rumi you idiot. Future Rumi.
Kimmy: It's pretty clear that Mi-Yeong is Rumi's kid from the future that time traveled to now to fix something.
Celine: That's impossible.
Kimmy: Its the only thing that makes sense. Do you have a better explanation?!
Kimmy: Then it looks like I'm staying, you need the help.
Kimmy: You can barely hold it together with Rumi.
Celine: Fine you can stay.
Kimmy: Awww look at that! My unnie can change! Admitting you need help from your maknae, such a big step for you!
Celine, blushing: Shut up! Go set the table or something!
