Sung Yong-il

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

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.

Baek Nam Bong (Song Chang Ui) is known as Dr. Frost. He became a professor in psychology at early age. He is extremely bright, but he has difficulties sympathizing with others due to an injury to his frontal lobe as a child. During the day, he now works as a counselor at the campus counseling center and at night he works as a bartender. He then begins to work with a teaching assistant, Yoon Sung Ah (Jung Eun Chae) at the counseling center. Yoon Sung Ah is enthusiastic with the clients needing counseling. They work together to solve problems who go there for help.

Choi Kang-Soon works as an assistant manager at a company. She becomes a victim of a hidden camera. This inspires her to fight against injustice.