The Temptation of the Pampered Wife: the President Forcibly Dotes on Him 99 Times

Country K was originally a monarchy, and the male protagonist had supreme rights as the prince of King K. One year, the male protagonist was on vacation on a private island. He inexplicably lost all contact with the outside world and was assassinated. After escaping under the protection of the female protagonist, he returned to China and learned of the coup. In a critical moment, the heroine protects the hero, so the hero's father (the reigning king) is shot and killed. The heroine is framed and misunderstood. The hero executes the heroine in anger and throws the body into the sea...