Sooo... the glasses...
1) your eyes only seem smaller if you wear concave glasses (for correcting short sight/myopia) and yes thick ones, but if you don't actually need them you will totally f*ck up your eye sight by wearing them (do not try this in real life)... it would make much more sense if she was wearing contacts for the dates (but MC can't have bad eyes right? - Stereotypes)
2) People do look completely different with glasses or even if they switch the model BUT not to the point where they become unrecognizable (it's similar to a haircut)
3) IF you need glasses "You wear them on the beach?" Is the dumbest question ever... because you can wear contact lenses yes, but then you have to be really careful not to lose them when you go swimming and if you don't like that glasses it is (you can put them away when you go swimming or leave them on, whatever you prefer).
This just ticks me off so much because I am shortsighted and I have to deal with all that annoying stuff. People who write about using glasses for disguise or fashion just don't understand what it's like to wear them all day no matter what you do.
Also both the MC and his Ex are Relationship-Creeps (plus horny), the female MC is totally indecisive and since there are 170 chapters out already I doubt I'll see development anytime soon so I'll spare myself the trouble and quit reading now