A young man lives with his dog, an unconditional love is interrupted by a young woman's jealous father.

The series revolves around the journey of music producer Wang Po Han and his assistant An Yi Qi to find the copyright owner of the mysterious song for their artist, A-Lin. They also came across a diary belonging to K who is the producer of the mysterious song and traveled into the life story of K through the diary. The diary tells the story of K and Cream, two orphans who journey through life and share experiences in sadness and joy together. However, K is diagnosed with fatal leukemia cancer. Knowing that Cream's biggest fear is to be left alone, K keeps the fact that he has terminal cancer a secret.

The history of legendary rock band Chicago is chronicled from their inception in 1967 all the way to the present.

Due to a misunderstanding, Lee Soo and Kyung Woo Yeon have held a crush on each other for over 10 years.Lee Soo works as a photographer and he is attractive. He is also mistaken for a model many times. Kyung Woo Yeon works as a calligrapher. She has had a crush on Lee Soo for the past 10 years, since she was 18 years old.

A slice of life drama that explores the overwhelming, messy, difficult and beautiful experiences of 5 teens as they navigate relationships, sexuality, grades, an online life, family pressures and taking risks during their final year.

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