Xuan Mu called back the doctor, "What's the cause of it?"
As the doctor observed the couple with teary eyes and heard Bing Shi's wailing, his own eyes became a little damp. "It's usually a genetic disease. But your parents have no such symptoms. Usually, the patient is all healthy before the disease appears. It shows up suddenly without notice; some studies showed that there needs to be some triggering factor to cause the actual disease."
Bing Shi, who was hugging Xuan Mu's waist, abruptly distanced herself. She ran to the end of the room, her eyes opened wide, her trembling mouth agape, "It's my fault. Xuan Mu, it has to be my fault..." She clutched her chest and stomach.
Xuan Mu rushed towards her, but Bing Shi avoided him, "No, don't come near me! What if I make it worse..." Xuan Mu ignored her plea and caught her by the waist. He gestured for the doctor to leave. "No! Let go of me!" Bing Shi kicked and punched him violently, "Stay away from me!"
And let me know in the comments what arcs you want to see. :)