In the story, Ye Xinya was also sent in the school as Ye Xin. However, because the wealthy Han family asked for the hand of the direct line's daughter, her mother did everything to get her out of the school.
That happened a year before the male lead was sent for 'rehab.' They reasoned that 'Ye Xinya' was still abroad, so they postponed accepting the engagement.
Of course, in reality, she was nowhere abroad, but already in the school, riding along with her uncle's scheme to go back to being Ye Xinya. Like what happened in the current timeline, she discovered it late that it would be very hard to escape.
