Hana was brought directly to the hospital to get her wound treated. Since she was unconscious and the hit on her head seemed bad, the doctor suggested that she should be admitted to the hospital.
On the other hand, since Huang Li's place had cameras around for security purposes, one of the cameras was placed inside, pointing towards the entrance and it caught everything that happened earlier. He sent a copy of it to the police and thanks to the video, all suspicions on Qiao Nuan's death turned to Hana. Shi Enxi's schedule on the court was even delayed just so they could investigate more and find out who was the real culprit.
Since Hana was unconscious, the police were not able to interrogate her so they assigned men to guard the room just so she wouldn't be able to escape once she wakes up.
