She planned to leave him after knowing the real way to return to her world with her ex bf so he broke her ankle so she cant escape. When she learned the truth about their past, she just accepted her fate. I hate how she's so bad in communicating. All of this can be solved if she just open her mouth.
Another spoiler, there's a girl demon who needs a swan to get her pregnant. She's helping the ML in his ritual before to get the FL back because she needed one to solidify her status. It's rare for a demon to fall in love with their swan, they are basically a tool for breeding but ML did.
She can walk only when roth is around and anna describe that walking felt like her feet was stepping in a shards of glasses so she give up the thought of walking. He didn't broke her ankles but he cast a spell on it instead. Anna doesn't have any reason to go back to begin with but she still goes to the lake and found out joseph is gone— even tho rose gave her the truth on how will she go back again, joseph got taken away by the countess who's also a demon (joseph is a male swan) anna decided to go back at the mansion, confronted roth and roth gave her the diary which anna read and her memories came back. After that, rose disappeared, roth planned to remarry anna again, svanhild became happy and anna overcame with guilt she started to care for svanhild bc she left the kid. Roth doesn't care who was the reason she go back and she doesn't want to hear it

Just finished the novel and it was so rushed, many plot holes to the point it's so disappointing. This type of manhwa that has so many potential but chose to end it abruptly, which make lose interest.