The Han family being taken advantage of was so ridiculous to others. However, any good family who wanted to maintain their reputation would go to any length to keep any scandal from happening.
Regarding Han Mei's mistake before that resulted in the marriage now, Han Jie was not so sure about the complete details.
Han Jie wished she knew who was draining the family so badly. She knew she wouldn't be able to fight him or her, since nobody was saying anything about it. Even her father decided to compromise.
However, if she knew who the meanie bully corporate person, she'd draw him or her a very graphic death and send it to the person in question as the end of the new series she was going to start based on her sister's life and the person as the bad guy. The bad guy being a cursed rat that no one would kiss to help lift the curse.
Han Jie slept with this in mind. She did not know the time she managed to do it, but she still woke up early.