Thank you Dondin^^ I also have a lot of concerns about the code part. The reason I don't upload the complete lecture code is because I think that although it may be a little more difficult, you can learn more in the process of coding like this^^ I've had a lot of experiences like that. Even if you don't understand it well in your head, if you follow the code, you'll naturally understand it^^ I'll continue to think about how to do this part in future lectures ㅎㅎ