Whether you like a person or not initially, you can become comfortable with the presence of the person after some time. Especially when you know that your life is forever intertwined with that of the other person. Feeling between spouses and brothers and sisters would fit into 'jung' nicely. A marriage based on courtship and love is a very recent concept in Korea, as is for many other cultures. But often, they don't live happily ever after.
Love is after all much weaker feeling than affection.
Whimsical, short-lived, and often has devastating side effects. Korean traditional marriage is the beginning, the starting point of love between two people, permanent companions for life sharing family and flesh and everything else. It's up to them to make their married life a success. Time will help them if they try. It's known to happen.