I really enjoyed this drama and I hope you will as well. Initially I was attracted to the characters and the slapstick was funny. As well, I had been reading a lot of mangas and light novels or webnovels and I was curious how this would translate to tv. There were several vignette using different medias where it be artist rendering, a stage, moving picture frames, etc, to invoke all the various ways art can be displayed. The subtext: it not about the media it's about the message. How good this message, or story, determines the quality of the product. Just like in your favorite deep novel, "ei the russian novel you were supposed to read for self enlightenment", the character development and growth is integral to this drama. The character progression in Business Proposal was a joy to watch as it was nuanced, subtle, and lighthearted. Really who wants to be pounded with doctrines and have your thoughts ground to an acceptable refinement. There's the church for that.
All four main characters have flaws. If all the characters were defined by their flaws then it would be true to describe this as cliche. Rather these flaws are the springboard from which we witness the four characters grow. For example the ML lead is fond of saying "he is great at many things". Yes he is rich, tall, and handsome. He is also jealous, thin skinned, overly competitive, and vindictive. Without love, this character is doomed to a life of misery. It is through the journey of love that he is able to understand himself better and take a more accurate look at his surrounding. The colours are really beautiful if you look at them.

p.s. I love the ending. these people are young. they have their whole lives ahead of them. With their partner, they are taking that walk into the woods.