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.

In their final year of high school, Dowan feels time slipping away with Jaeyul, and the fleeting moments between them become ever more precious.

Jeong Yeon joins the research lab of Yu Geon, his former private tutor, as an intern. However, Yu Geon’s attitude upon their reunion is cold. An experiment that studies emotions, and two people facing each other once again. Subtle waves begin to ripple between Jeong Yeon and Yu Geon.