This drama overall is quite moody and heavy, as expressed visually through the color. So I think that's why the tempo is rather slow. And the FL's character is thereby pessimistic and gloomy due to her past ghost. So that's why she met a ML who is like a bright sun. I like the ML's traits as he's childish in a way, but in a good way and knows what's he doing: trusting his people, not overly confident and reckless.
The racing topic is very interesting, exhilarating and yet with a dark mood. The drama is very captivating and charming in its own way. The storyline is written well. It's a bit slow to my liking but i don't really mind that.

Edited:
I like the ending. The ML completed his journey. At first all he wanted to be fast and furious to win. But afterward winning has a different meaning to him. He resolved his misunderstanding with his sister and acknowledged his responsibility to his family business and he found the way to the best of both worlds. Plus he has a GF/best engineer and all of his companions. Showing the last race is not necessary because it is not his last race. And technically it's not as exciting to show to the audience because Formular E (electric cars) is slower and his previous races.