In my head canon, I imagine that after she won the mayoral elections, she now works as the Senior Secretary of the President in a world where people are "Hellbound" and random monsters come out to damn people to hell.
Its just a story of 2 people who suffer at the hands of a cruel fate. Many people relate to the suffering, my life is also not better than the leads in this story, so that's why people like it. There is no romance aspect, its just people brought together by a cruel fate.
nice to see finally people starting to actually see this drama and rate it properly. When this was first released, people were just shitting on it relentlessly.