Personally, I started watching the drama because of the cast and plot summary. The acting was on point and so was the story, I guess it isn't for everyone and that's okay. It's a series based on healing, something new for Korean dramas. I watched this while it was airing and loved every second of it, myself and many other people didn't know about the 'intimate scenes' and watched the drama because it was good. I respect your opinion and I probably didn't need to write such a long comment haha but yeah just saying! :)
I believe K was like an angel sent to I-Land, he took all the heat, helped the boys improve, led them, was their reliable hyung and when everything was said and done, he just, left... I will wait for K, he brought so much happiness to my life!