bc she wished for MC to become an adult in her 4th life, and she also wished to forget everything that happened in their previous lives (including MC), the system made her wish come true but in exchange, YW was given really bad luck. That’s why she failed to become an idol.
In the current life, MC is the one who gets the system after YW forgets everything. YW can’t see the system anymore.
The not so confident YW is this current YW, but the previous lives YW appears in YW’s dreams (and sometimes takes control) which is why YW kind of knows what happened to MC, the memories from the past lives are coming back to her
Also later, after MC and YW learn about each other’s systems, MC removes YW’s bad luck but in return, MC receives one karma

yall I’ve been reading the novel until chapter 318 in 2 days and I can say ts is so PEAK!! I love it so much, and this is coming from someone who doesn’t even like reading novels btw.
SPOILER
This is not yuri btw, but it can be lowkey interpreted like it. Yeonwoo is always jealous whenever Hyesung gets close with someone, and there’s a part later where YW confronts the MC about why she and the MC don’t have a ship name when the MC has one with her roommates (Maze). Later after debut, there are two people who really like the MC — Hong Siyeon from Strawberry Killer (this group is from the MC’s ex-company) and the famous actress Seo Ian. After debut, YW gets into acting and her first role is a ghost because she likes creepy things. MC also acts with YW in that drama together with Seo Ian and YW gets SO jealous lmaoo.
Also at a fansign, the Polars shippers (YW × MC ship name) ask YW and MC to do the Pocky Game, but MC doesn’t want to because she says YW is still a baby (in the end they still do it because YW takes the lead).
They’re so cute istg, but MC really sets boundaries and doesn’t want to go too far with YW, while YW constantly wants MC TvT
Their group name is Jewelic, and the members are:
1st place Yoon-sung (MC)
5th place Na Yeon-woo (MC’s fav girl)
6th place Lee Ju-ha
12th place Cha Joo-yeon (red hair from YW’s company)
9th place Kang Hae-in
3rd place Han Young-won (Youngwon sulked after hearing MC call her last DHWHDH)
There’s also another group called Irisis:
2nd place Hyun Nana
10th place Ji So-hyun
4th place Gil Ahyeon
7th place Namgung Seol
11th place Sungbin
8th place Nam Min-joo
I feel bad for them tbh since they don’t have someone experienced like MC and Han Youngwon, so they always get blamed and get bad things pushed onto them. I haven’t read the other chapters yet (there’s 450 chapters), but I hope they cancel the “only one group becomes permanent” thing because I really love Irisis too.
There’s also a part (after debut) where MC used to get bullied in her past company (where Strawberry Killer is). And after they come back to Korea from doing a concert in Japan, MC gets her neck slashed by an anti.
Honestly a LOT happens after they debut. They even get called the “bad luck group” along with Irisis TT
Oh, and MC didn’t cheat. All of her skills she has now are actually hers. This is like her 5th life. She’s actually 19, not 26.
In the first life, MC, YW, and Jooyeon (the red-haired girl) are in the same company, but something bad happens to MC and she quits being an idol. YW feels bad because she thinks it’s her fault, and that’s when the system comes to YW and gives her the ability to rewind time. But even in the 2nd and 3rd lives, MC still gets hospitalized, and in the 4th life YW asks the system to make MC become an adult a bit earlier so she doesn’t have to see MC suffer.
If I remember correctly, her actual stats are:
Visual: 4 stars
Vocal: 5 stars
Dance: 3.5 stars
Rap: 3.5 stars
Star Quality: 5 stars
The reason her stats were so bad in the beginning is because YW made them low so that MC wouldn’t become an idol LOLL
There’s a lot I want to say, but I think I’ll stop here and just post it on NovelUpdate later