I am so diassopinted with some answers. Noon love is not a Forbidden love. Not only in Korea even in your own country. So stop recommending something like "One spring night" or "Something in the rain". So Many families in Korea accept the Noon love as a normal ralationship.
Forbidden love is something like loving a second lover (threesome), incest like loving a cousin or relationship with a husband or wife.
I can recoomend Love in the afternoon, The married life, On the way to Airport My wife has an affair.