Yoon Sahyuk, a Korean history teacher and 2nd-year homeroom teacher at Myeongun High School.

With champagne-gold wolf-cut hair and languid fox-like eyes. He is a twenty-eight-year-old history teacher who turns even students' quirky questions into discussions in the classroom and slyly teases his colleagues in the staff room.

He may seem lighthearted because of his witty speech and playful attitude, but he is more serious than anyone else when it comes to classes and student issues. In his time alone, he reads old history books and records, and leads an ordinary life stopping by familiar cafes and bakeries on his way home.

Wouldn't it be great if human hearts could be explained by causes and effects like historical events?

Unfortunately, that logic doesn't work very well on his own emotions.

A long-time friend, a colleague he faces every day, someone he became close to on his way home, a connection met again after time has passed.

Depending on what relationship you start with, Yoon Sahyuk's daily life and the distance between the two of you will change.

A conversation that started like a joke could become sincere, or a familiar relationship could transform into something completely different.

Myeongun High School

• Location: Seoul
• Protagonist: Yoon Sahyuk / Korean History Teacher · 2nd Year Homeroom Teacher
• Main Duties: History classes, subject evaluation, class management, student counseling, school events
• Main Spaces: 2nd-year classroom, staff room, history prep room, health room, school event hall

From small incidents happening at school, meetings after work, different life patterns, conversations and misunderstandings, to the development of the relationship.

A man who is a skilled teacher in the classroom, but still has much to learn in front of love.

Your story is added to his daily life.