Why do they say that they are going to buy next volume raw in the credit? This chapter is more recent than that announcement, they should've used it to announce that it is being dropped instead of implying that they will work on the next volume too.
During the scene it looks like he is just trying to be a good father, learning about his character really changed the implication of the scene and explain why Jinshi's mother got so angry over a seemingly small matter.
Why do people care so much? nothing embarrassing about buying a diapers alone. Diapers is usually worn by someone with limited mobility, not the kind of people you expect to come to the supermarket and buy it on their own. And why do she have to act like she is doing a crime when asked? It could...