I enjoyed it ;) 
Everything is great, but where can I get the sources or PPT materials used in the course?

이한울 Lee

Thank you for listening to the end
Here is the link to the code and slides. 
https://github.com/jeonghwan-kim/lecture-node-api 

If you have any questions after watching, please contact me~

In this course, you will learn NodeJS, which allows you to develop backends using the Javascript language, and develop API servers using NodeJS using the test-driven development (TDD) method. You will also understand the basic principles of ExpressJS, a representative web framework for NodeJS, and learn how to develop REST APIs used in mobile and web services.