A heartfelt school drama about a new high school teacher who struggles to maintain challenging relationships with students, their parents, and colleagues in an unreasonable educational environment. While constantly looking for the right time to quit, she somehow strives for the sake of her students. She openly expresses her emotions by laughing heartily and venting her frustrations on a secret social media account, gradually developing trust and respect with her students.

Rio Sasaoka is a high school teacher from Generation Z who jumped into the education field with dreams and hopes. However, the harsh reality is beyond imagination, and she is living such a stressful daily life that she is considering quitting in her second year. She deals with students who interpret “freedom” too broadly and behave recklessly, parents and local residents with excessive expectations of the school, and senior teachers who push trouble-handling onto younger staffs. Rio vents her daily complaints on a secret SNS account, talks to her kind boyfriend, and maintains her balance with her inherent energy and brightness by occasionally saying, “Teachers are human too!”

However, her patience finally reaches its limit. She decides to resign, but simultaneously, a sudden vacancy for a homeroom teacher arises, and for some reason, the responsibility falls on Rio. She finds herself in charge of third-year students as a homeroom teacher for the first time, leading her teaching career into an even more challenging path! What is waiting for Rio then?