Once again, the fact that you find the potentional age gap weird and you wouldn't be attracted to much older person doesn't mean it's wrong (as they are both adults) or that couples like this don't exist... Plus, I highly doubt it will even happen in the drama chill.
I thought this would be more melo than romcom... Though I have a feeling it will be mixed genres and it will be more serious in the second part. let's see