I have to say: I review this show having read the novel before, so I'm sorry if I compare the two things a lot. I just can't help it.
The Middleman's Love could have been either a full-comedy show or something really deep and emotional. If you read the novel, Jade is such a goofy character, but he has some insecurities that eat him alive and give deepness to his persona. The novel is basically a journey through an average person's mind, someone who couldn't just believe to have something good. It's a topic we all relate to, I guess.
What the producer did here is taking the novel and exaggerate the comedic part, trying to have a more entertaining show, with what they had. Maybe a budget matter, or maybe it's just a choice of the production team, but they went all-in toward the comedic genre.
I personally don't like this choice since I loved the book so much, but I still think this is a great show. The main flaw is visible since episode 1: Jade's behavior appears just immature for a 28-year-old man, it exceeds goofiness. Does it make The Middleman's Love a bad show? I don't think so. It's light, fun, and something you want to watch after a long and tiring day at work. The romance is there, both the main actors did a magistral job portraying their characters. Even if we can't see much of Jade's most intimate secrets, we can see how affected he is by people's thoughts and words, and how much he tries to keep himself safe from being hurt furthermore by love. As soon as you hit episode 5, you understand how that smiley mask... is just a mask. And I do admire the production team for this kind of message.

The biggest flaw is the little screen time of the side-couple. We don't even get to understand what is going on between them. It makes me mad how they left their story hanging for everyone, but those who can watch the uncut version.