But in South Korea, they didn't just test people with symptoms; they tested anybody and everybody suspected of having contacts in certain region. Mortality rate is still significantly higher than common flu.
It's 0.6% based on 42 deaths out of 6,284 confirmed cases out of 158,000 tests out of a population of 51 million. The flu is 0.1%, but COVID-19's mortality rate very easily could still be significantly overstated.