A couple wearing face masks to help protect against the spread of the new coronavirus watches trees covered with "love locks" on the Namsan Mountain in Seoul, South Korea, Thursday, April 23, 2020. For most people, the new coronavirus causes only mild or moderate symptoms, such as fever and cough. For some, especially older adults and people with existing health problems, it can cause more severe illness, including pneumonia. (AP Photo/Ahn Young-joon)