There are a lot of reasons why this show is a success. The story starts off with an appeal. It builds a certain suspense and interest for whats coming.It has diverse characters and moral lessons... Indeed it is another proof how korean writers are creative . .. The only part that I didnt like was towards the end it suddenly turns into a lovestory choosing Yiseo over Soo ah.. They couldve kept Yiseo as a sidekick to Saeroyi and not as a love interest..