Waiting for You to Allow Me to Grow Old, Waiting for My Love to Burn Out

Help Me Find a Book, Be

The male protagonist's father seems to be some kind of mayor, and the male protagonist can design. The male protagonist got into a car accident while sending the female protagonist abroad. Later, the female protagonist bought the house that the male protagonist had designed for them. The female protagonist asked the male protagonist's parents to adopt a boy according to the male protagonist's request.