This Is an adorably straightforward romance with very likeable characters, that plays with role reversal and does it well. We have cute, timid small guy that's surprisingly confident and reliable when push comes to show, and a strong, silent girl that's actually a tad awkward and insecure.
In the middle of it all, boxing is put there and it works surprisingly well, providing the foundation around which the romance is told.
It's main sin however is it's glacial pacing. Read this in huge chunks because the chapters feel too tiny to be satisfying.