Blockchain, people can be as mean or as nice as they like.. Bern and Rando have their way of doing things which is what it is but gets a message across with little room for confusion. As to @haejin.. No idea, but I am sure you can follow him on his twitter and youtube ( I heard he has both). Perhaps it is just Christmas and he is doing the family thing. I do know that writing and posting, consistently are hard work and he puts in quite a bit here. Reach out, message him, or.. invest in yourself, so as you depend on no one.. Hope this helps.