Lee Young-Joon's family runs a large company and he works as the vice-president of the company. He is smart, rich and handsome, but he is arrogant. His secretary is Kim Mi-So. She has worked for him for years and she is perfect for him, but Kim Mi-So decides to quit her job.

Ki Moo-Hyeok, a lawyer with a high winning rate, only cares about money. Due to a murder case at a high school which he deals with, his reputation as a lawyer hits rock bottom. To regain his good name as a lawyer, he sneaks into the high school and work as a temporary teacher. He tries to reveal a secret which the students have, and gets involved with Teacher Ha So-Hyun, a P.E. teacher who loves her students. They then face the students'secret.

Ban Sook, a 160 year old goblin, needs to kiss 10 times to become a human being. With each kiss, he learns a human emotion. Can a goblin who wants to be a human being and a human being who hates other human beings coexist?

When mysterious alien spheres start invading the world, high school students are called upon to join the world’s first war against extraterrestrial forces.