Yoo Jae and Han Joon share the same class and study together, fostering a close bond in their relationship.

Han Joon becomes jealous as he observes Yoo Jae taking the initiative to care for Chae Young, while Yoo Jae grows increasingly concerned about Han Joon's friendship with Jin Hwan.

Yoo Jae, out of concern for Han Joon's family situation, decides to hide something from his friend. However, Han Joon eventually discovers the deception and feels deeply hurt by it.

Yoo Jae, unintentionally misinterpreting Han Joon's thoughtful actions, misunderstands his friend's true intentions, unaware of the deep emotions that lie within Han Joon.

After their fight, Yoo Jae and Han Joon lose contact with each other. However, a year later they see each other again at a college reunion.

Han Joon's senior is particularly considerate about him which makes Yoo Jae jealous, and the two of them have an argument about it.

Han Joon's deliberate distancing makes Yoo Jae decide to find him out and clear things up, and Yoo Jae proposes an idea.

The original plan was to celebrate their anniversary at a restaurant, but when Han Joon temporarily goes missing, will Yoo Jae be able to find him again?