18+ Seniors Of Class 5

School days that remain as exciting memories of studying, or bullying, and running away for some.

After graduation, a text message is sent to all 3rd year class 5 students, who lived their lives, to participate in the reunion.

A text message from whom the sender is not known.

A prize of 10 million won.

Although this all sounded very suspicious, they all attended the reunion half-jokingly, where they will have to face their own past, the one they had buried in their deepest memories.