Were I Lil Kim, I know exactly where my first three warheads would go, and in what order.
First right in the middle of Seoul. Makes the DMZ a radioactive DMZ and removes 90% of the SK forces and the US forces.
Second slap bang in the middle of the US task force in the sea of Japan. One advantage of all these missile tests out to sea they've been doing is they've got it gridded to a fair-thee-well. Can probably hit within 100 feet of what they want with no terminal guidance by now.
Third on Seattle - maybe LA if I could be sure of hitting it.