Synopsis When Kang Bok-Su (Yoo Seung-Ho) was a high school student, he was falsely accused of committing violence and kicked out of school. This was caused by his first love Son Soo-Jeong (Jo Bo-Ah) and a male student Oh Se-Ho.
Kang Bok-Su is a now an adult, but his life has not gone smoothly. To get revenge on Son Soo-Jeong and Oh Se-Ho, he returns to the same high school as a student. The environment at the school has changed and Kang Bok-Su gets involved in unexpected cases.