Masked Bride, Unmasked CEO

(Don't open this novel lightly, or you'll become addicted and be unable to stop reading for three days and nights...)
One pretends to be insane to find a beloved teacher, while the other feigns foolishness to stay alive.
A marriage contract binds them together.
After marriage, the couple hides their true identities, excelling in their respective fields.
During their close interactions, they develop feelings for each other.
One day, the exceptionally handsome Richard corners her against the wall, a wicked smile playing on his lips.
"My dear wife, my grandfather wants a great-grandchild. How about we fulfill his wish?"
Rubbing her sore waist, Catherine grits her teeth and says, "Who said Richard was paralyzed?"