Hello, Younghan! After completing Younghan's recent lectures, I was working on a toy project when I encountered an internal call problem that you explained in data access technology. At that moment, I thought, "Oh, this is the part that Younghan explained?!!" and watched the lecture again, modified the code, and was able to solve the transaction non-application problem that occurred during the internal call.!!! Thank you for always preparing such great lectures. ㅎㅎ I'll look forward to the next lecture! I will always approach backend development with technical humility. Thank you.!!!