Why does the old man of Doomsday Spacecraft want to protect the mistress?

I thought I was the father of the hostess, according to Douban.

1. The old man in the doomsday spaceship thought he was the woman's father, and he always protected her. Even in the end, he didn't want to kill her or eat her.

2. Doomsday Spacecraft, also known as People, Space, Time and People, tells the story of people of different ages and occupations on an old warship.