Responses

There's nothing to convince though. What his grandparents think is irrelevant. They weren't involved in the raising of Yiyi and he is now a grown adult. The grandparents will know their place. He doesn't need permission from two people he has only started to get to know, they will know not to overstep lest they want to incur their daughters anger from hurting her child.
I dont think the grey haired aunt is evil. She obviously knows that Jinhao won't get He lingwei. Her point about Jinyao was that he is stupid to choose love over power. Cause if Jinyao marries into the Qin family then he would be more powerful and has more advantage over the company, and the grey haired aunt is on Jinyaos side and wants him to win. Thats her point. She also misunderstood the fact Jinyao is in love with some girl (she was referencing to the blonde girl who Jinyao used to take care of due to the request of his professor and he also took her to parties and all probably that's why. But what no one knows is that Jinyao actually loves someone who is from a very powerful family. It's basically a win win for him (power and love) but idk if yiyis grandparents would be able to take it well aha since it's both guys buts lets see what is yet to come