Do-wan grows increasingly anxious, afraid that he and Jae-yul, the boy he has secretly loved for years, will drift apart after graduation. After years apart, the two meet again by chance, and Do-wan realizes that the moment has come to finally confront his feelings.

高三那年，介于春天与夏天的暧昧季节里，道完面对毕业与分离的焦虑，他心中藏着不能说的秘密：对宰烈的暗恋，害怕他们在毕业后会渐行渐远。多年后，两人因缘际会再次相遇，久别重逢的瞬间，那个季节的情感，又悄然苏醒了。