I think this is the best time to end the story. I don't know what else the story can build on from hereon when the two are able to finally move past their hurdles. Maybe one more chapter to just to see how the characters are settling in. The idea of delving deeper into the concept of synesthesia had already set sail long ago and could have added a more solid foundation to the story in which the work is based on.
@JimmyCarrot@Darkylin ok phew, I checked the raws and this doesn't seem to be the ending of the actual series yet. The raws are up to chapter 30 for the jap raws and 31 for the korean ones, so still ways to go
though what's interesting, is that from what I briefly saw, the Korean and Japanese ones seem to have slight differences in the story