Does anyone else know of any kdramas that deal with situations like Ha Joon's? I won't be specific due to spoilers but a little bit of a side character arc like there was in this is fine.
Let me just say something for all of the people that have dropped or put Triangle on hold, it definitely gets better with time. Personally, I thought the first few episodes were boring, but they were necessary for the setup. It still may not be your thing, but try to stick with it a little past the first few episodes and see for yourself.