Cha Do-hyeon and Yeo Eun-ho are neighbors and best friends who have grown up together, inseparable for 19 years. Eun-ho has always believed they are closer than family, never realizing that Do-hyeon's longtime crush has already gone far beyond friendship. When a transfer student suddenly enters their lives, jealousy and possessiveness push Do-hyeon to lose his composure. As his most familiar friend begins acting strangely, Eun-ho is forced to reconsider what their relationship really means. This summer, will 19 years of feelings finally cross the line?
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