Girls who have a secret crush like romance in Korean dramas. How can you get a terminal illness? What do you mean?

Because in the past, the general routine of Korean dramas was that when the hero and heroine finally went through all kinds of hardships to get together, one of them suddenly became terminally ill or lost his memory in a car accident, which earned many tears from female audiences. This sentence of the landlord is a teasing joke, satirizing that the romantic bridge of Korean drama is terminally ill. .