A book I happened to pick up in a Sydney Korean bookshop, 한국어 회화 2 from 고려대학교 출판부 was a pleasant surprise.
Each chapter opens with a dialogue (and usually an interesting one!) and follows with a number of key grammar structures which were featured in the dialogue. Vocab lists and extensive exercises are also included. I like that there is not a great reliance on English within the book, it is only used in the conscise grammar explanations and vocabulary lists. I like the special chapters that provide writing prompts as well.
한국어 회화 is by no means the best textbook out there, it has a number of spelling errors and often mistakenly has “followed by” when “proceeded by” should be used. However it is a solid text book, the explanations are quite detailed and the examples are great. Answers to the exercises would be a nice addition though.
I won’t be going out of my way to search for the next level in the series, but I would pick it up if I come across it as it is a lot better than many of offerings out there.