Kyungsoo suddenly turns invisible one day, the only person he can trust is the man he met in the elevator, Kim Jongin, who is blind. 

Baekhyun and Chanyeol have a sleepover that changes everything. Kyungsoo has the courage to talk to hard-to-please Jongin after someone tells him a little secret. The sophmores of Goyang High School must struggle through a science fair. Simple? Not quite.