Mu's mother shook her head weakly, her face pale, "I didn't know... I didn't know he couldn't be agitated... If I had known he had a heart condition, I would never have provoked him like that, I only found out afterwards..."
As she spoke, Mu's mother's emotions became somewhat uncontrollable, and her expression was very pained.
When she learned of Yingchen's father's car accident and his instant death, she was dumbfounded on the spot. She always felt that something was amiss. Having just had a big argument with him at home and then a car accident occurring not long after he left—it didn't matter how she thought about it, it seemed somewhat related to her.
Only then did the old patriarch Mu accidentally reveal the fact that Yingchen's father had a heart condition.
Leaving aside whether he had a heart condition, the reason he rushed out was directly related to her.