The news that the Yun family had offended both the Feng family and the Su family quickly reached Chen Yichen. He picked up the phone immediately to call Yun Xi, but she wasn't at home.
He asked the housekeeper where she was, and she said that Yun Xi had gone to see the Old Madame.
So Chen Yichen knew that she had instead gone to see Young Marshal Mu, because he was at home right now and no one had seen Yun Xi at the Chen family home.
Upon learning that Yun Xi hadn't come to look for him when things went wrong, but instead had gone to Mu Feichi, Chen Yichen felt something inside himself that he had a hard time identifying.
A stubborn person like Yun Xi never asked for help easily. Even though she had come to the Chen family's home a few times when she'd obviously needed help, she hadn't asked.
He knew very well how she had resolved the matter In the end. Young Marshal Mu had probably gotten involved.