In my opinion, Seju had to act as if she was strong and mature whenever she stayed besides Sumin, whereas moving to "One", she was like a vulnerable little girl that needs to be protected. I don't know if I'm being delusional but her expressions towards Won seemed very weak and fragile. Just like she said, she hasn't used to this kind of things where she has somebody being worried and taking care of her like 24/7. I like this current Seju who no longer has to suppress her miserable feelings more. She looks like any other girls that start to fall in love step by step now, she can drink freely (which means do whatever she wants now). I think she will be more expressive towards Won, not that emotionless & calm Baek Seju when she was with Sumin.
In my opinion, Seju had to act as if she was strong and mature whenever she stayed besides Sumin, whereas moving to "One", she was like a vulnerable little girl that needs to be protected. I don't know if I'm being delusional but her expressions towards Won seemed very weak and fragile. Just like she said, she hasn't used to this kind of things where she has somebody being worried and taking care of her like 24/7. I like this current Seju who no longer has to suppress her miserable feelings more. She looks like any other girls that start to fall in love step by step now, she can drink freely (which means do whatever she wants now). I think she will be more expressive towards Won, not that emotionless & calm Baek Seju when she was with Sumin.