A high school teacher looks at his empty classroom while his student studies at home. Past baseball trophies and megaphone are surrounding them. During the COVID-19 pandemic, even with all the changes in life, the student continued studying and practicing baseball steadily.

The two exchange words, and little by little reach out to each other.

The teacher understands the frustration of his students, so he sends a message to them through his online class. The student who had often missed hearing the message by fast forwarding the online class, listens to the message carefully. “The effort you put in during this difficult time, that’s what you call real strength.” This becomes the student’s turning point and once again he starts to put effort toward the upcoming important college entrance exam. "The year we fought against something invisible, was a year supported by something invisible."