Chen Haoyan couldn't possibly know the events that transpired after that, but based on deductions common sense would suggest, Wang Yuxi must have reassured her and held onto Chen Kai with a sense of reluctance before leaving.
It's a pity that Chen Kai was too young at the time and his memories of these events had gradually blurred.
Chen Kai hung up the phone, his heart not devoid of a multitude of feelings. He had always assumed that his mother had left because she thought his father was too poor. These assumptions were further confounded as he grew up to see gold-digging women, cementing his deductions.
Every time he complained to his father about why his mother left, his father's face would crumple with pain before gently stroking Chen Kai's hair, speaking with grave sincerity.
"Do not resent your mother, she was really a great woman. She left us due to some inevitable difficulties. I believe anyone in her shoes would have had no choice but to leave at that moment."