A human drama about Kang-Go-bi, a new barista who entered the world of coffee with pure passion, learning about coffee and people as a student of the coffee master Park Seok. After coincidentally finding the 2 Machine Coffee shop and drinking Park Seok’s freshly made coffee, Kang Go-Bi drops his civil servant’s entrance exam and decides that this cafe is worth giving his all. In order to get Suk to warm up to him, he tries to appeal to his worth by going into the store and working day in and day out. After seeing this side of Go-Bi, Suk decides to take him as a protege....

Choi Joonwoo is an 18-year-old boy who is used to being a loner. He is not good at expressing his emotions and doesn't try to establish rapport with others. But he has a cute and silly charm, and his life starts to change when he transfers to another school. Yoo Soobin is a top student as a result of her mother's ambition and extreme pressure. Without a clear dream and goal, she lives in a daze. Her real dream is to live independently. After she meets Joonwoo, her life gradually begins to change. Ma Hwiyoung is very handsome and gentlemanly, and everyone trusts him. But under his perfect appearance, he has an inferiority complex. He seems very tough, but he is actually very cowardly. When the transferee Choi Joonwoo appears, the iron wall he built slowly begins to crumble....