the problem isnt the lack of development, the story per see has a nice pacing and the comedy is good, a lot of events are different from other mangas of the same genre so you dont feel that "I already saw that before" all the time like in 99% of any other romcom. But the MC does litterally EVERYTHING for the girl, he gives her money, time and full commitment and she takes everything and say "oh, thats nice" and turn her back and go away. So theres 140 chapters of this happening and this is frustrating as hell, even so the MC keeps doing so over and over. Is totally normal to get bored at some point, the 2 main characters are boring and they relationship is one sided for such a long time... But even so it worths the read just for the other characters and interactions, just dont expect any romance.