Lina, thank you for the great review!! I'm grateful and proud that you diligently took this lecture as well~! I'm relieved that it seems to have been helpful, even though the content might not be easy to grasp and is difficult. I feel very apologetic that the next lecture's expected schedule keeps getting delayed.. I will try to prepare diligently(?)! Regarding distributed data modeling practice, actually, the previous lecture "Large-Scale Systems - Bulletin Board" also organized microservices and data models based on the aforementioned concepts, However, the relationship between the system and models in that lecture wasn't complex, so it might not have resonated much. In the distant future, I am considering a lecture about building more complex systems (for example, a feed), and it might be even more impactful then. I will think a bit more about how I can structure and deliver it! Lina, please take good care of your health and hwaiting! Thank you.