A wealthy professor consumed by sex addiction. A group of students drawn into a forbidden ethical abyss. When a dangerous game of temptation and taboo takes an unexpected turn — a student mysteriously disappears, and everyone believes their secrets will be buried forever. But the arrival of a new face becomes the first domino to fall. The carefully constructed lies, hidden desires, and painful truths of the past begin to unravel, exposing a world of deception and obsession one layer at a time.

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.

在《冬日狂热》后，延浩和裕俊已经甜蜜相伴到第二年。穿越了最初寒冷的冬天，他们一同走过四季，终于迎来了并肩度过的第五个季节。在这个炎热而充满活力的夏天，拥有相同温度与心意的两人将面临全新的生活节点，共同开启一段关于陪伴、成长的炽热罗曼史。

Jun, the grim reaper who manages death, receives a list of names and descends to the human world again today. School, unfamiliar scenery, and a strange self. But the task seemed simple: he simply needed to find the target of the code floating above his head. But the code written on the register hovered over two people simultaneously. One was Hyeon, with his indifferent gaze, the other Yun, with his playful smile. The question, "Who should die?" soon morphed into "Who should live?" and Jun, hiding his identity, began living as a student alongside the two.