Okay will watch only for Joo Won. Because I have no doubt about his acting skills, but seriously in all of Korea they could not find a more suitable actress than Yoona. I have nothing against her but I doubt she can pull playing Nodame.
Do I have to watch the three other seasons before This?? Donghaaaeee????
Yes watch the previous season to follow the background story , or you may feel lost but other than that the crime are mostly unrelated to the backstory, but I would say that it's important to follow the backstory because it's important to understand dr han.