Inseparable for 19 years, Dohyun and Eunho are closer than family. But beneath the surface, Dohyun hides a 19-year secret crush. When a transfer student arrives, fierce jealousy and possessiveness shatter their peaceful facade, making Dohyun lose control. Caught in his best friend's hot-and-cold attitude, Eunho's heart races for the first time. As their friendship turns into something more, will they cross the line? Download to witness this fiery summer romance!