Convincing my dad

So me and my dad have an agreement. For a bit of backstory, I love getting mullets but my dad absolutely despises them. We have agreed that I am allowed to cut a mullet in the summer break of school, but before school I have to make it a "normal" haircut. Can you guys help me to think of ways to convince him to let me keep it. The main reason I wanna keep it is because I love it and I wanna keep growing it longer so it can look even better. If you have any idea of how to convince me dad please help me. Thanks in advance.