Their plan was very simple. Wang Yu Yan and Wen Mei would enter the hospital.
While Wen Mei would accompany the doctors And Cao Guang for the meeting before the surgery. As the changing room was common for all the doctors and nurses.
Wang Yu Yan will dress up like Wen Mei and Wen Mei as Wang Yu Yan. As they will have masks on their more than half of the face so it would be difficult for anyone to recognize them.
Further anyone wouldn't have the time to observe so closely as everyone will be focused on the surgery.
After Wang Yu Yan would excuse herself followed by Wen Mei and they both will change their outfits to their real identities.
And that's how the surgery would be successful.
When Wang Yu Yan and Wen Mei entered the hospital they were welcomed by Cao Guang and the fellow teammates of the lead surgery that had already arrived.