The girl who was pregnant with Yin He's child was young but ruthless. She directly said that she wanted to be given a status and that she would call the police to protect her legal rights as a minor.
Yin He didn't want his file to be tainted, so he agreed to her previous request. However, he didn't get the marriage certificate because she was not of age to register. He endured his anger and comforted her, and arranged a house for her to stay and raise her baby.
This incident added a hurdle to Yi He's future marriage plan. It wouldn't be easy.
Grandpa Yin probably wanted to appease Yin Zhen by handing over the entertainment industry to her, as he was concerned about her relationship with the Wen family.