Cha Do-hyeon and Yeo Eun-ho, who were born in the same neighborhood and have never been apart, stayed together throughout elementary, middle, and high school, and were able to confidently say that they were as close as family, because they had been friends for 19 years."From day one, Do-hyeon and Eun-ho, who have been acting strangely, does not understand and are confused. A conflict that will inevitably arise someday, but Eun-ho doesn't want to believe in this current situation.