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From the beginning we can see she's not fine in her mind.
I can't remember what's number is it but the chapter when Yumi and Sunhwa were arguing, we can see a double reflection of Cheung-Un in the miroir.
She is obsessed with Yumi because for her, it's her savior, she's can't leave her because she's her everything.
For me, Cheung-Un is a very interesting and complex character, that's why I love her and I don't think Yumi would leave Cheung-Un too, she looks like to be really attracted to her
![](https://pic1.mangapicgallery.com/r/avatar/a7/u393874_50x50.jpg?2)
First of all, I think the arrival of Hayeon is likely to create a lot of tension.
I think she will try to make "fun" on Chung-Un, she even asked Sunhwa if Cheung-Un was mentally unstable.
I think her jealousy may make her very distant or extremely possessive.
I don't think Yumi is going to give it up with Cheung-Un because right now, we get to see her deep attachment for her.
Maybe she will try to help her? Like I said previously, Cheung-Un is really interesting and her story is still mysterious actually, remember the conversation with Ms.Choi and the oldest sister of one bully girl about the mother of Cheung-Un.
So many puzzles to solve in Birdcage.
All the mystery is there, the story has a lot to give
What do you think on Chung-Eun's character?? We all know that their relationship is not healthy... (︶︿︶)...
Uhhrrrggg. WHat will going to happen??