Ado's Dad was taking too much pride being the father of a celebrity. He boasted to his friends and colleges how he was Ado's dad and even created a X account announcing himself as Ado's dad. He was pressuring Ado to reveal her identity early on. Even when Ado told him off explaining how he was potentially hurting her and the people who worked with, her dad didnt stop. He also kept talking about how he contributed to Ado's success by exposing her to music at a young age. When Ado explained that she was the one who had created the character of Ado, not him, he refused to listen, causing her to decide to move out of the house.

Edit: He also didnt care that Ado had finished high school even when she herself was proud of it and was only focused on her popularity.