The Reason is Right Before My Eyes, You're Asking Despite the Obvious?

Ji Nuan stayed in the blankets, unwilling to step out. Even when Mo Jingshen called her over for dinner, she lazily responded with an 'en' and continued laying down. Finally, when Mo Jingshen approached and was about to pluck her out from the sheets, she frantically rolled over twice and wrapped the sheets tightly around herself, saying that she would head over immediately.

After eating dinner, she collapsed back onto the bed. She needed to have sufficient rest and sleep in order to replenish the stamina she had used up.

As for Mo Jingshen, she truly suspected if he was actually human. The one who kept moving on the bed earlier had been him. She had only laid under him and she was tired to this extent, yet he appeared as though nothing had happened. She really suspected that if the medicine had been stronger, and she had clung onto him without care for her own life, perhaps this man would have kept going and taken her last, final breath.