Jo Jihyun receives a letter one day, but the moment he sees the opening line “Dear, George,” he immediately throws it away. However, when he runs into his senior (Kang Seokwon), the subject of an urban legend-like rumor, who asks if he has read the letter, Jihyun freezes. Feeling guilty for discarding the letter, he agrees to have a meal with his senior and gradually becomes drawn to his kindness.

Jihyun, who had been struggling to survive between an abusive mother with a mental illness and a father who stood by and did nothing, finds solace and support in Kang Seokwon, who holds him up with all his heart. However, as Jihyun gets caught up in a certain incident, Kang Seokwon is severely injured while trying to save him. Fearing that Seokwon will be unhappy if he stays, Jihyun flees to study abroad in the United States, as if escaping.

Seven years later, Jihyun returns to Korea and coincidentally meets Kang Seokwon, who is now delivering pizza. However, Seokwon mistakenly believes that Jihyun is getting married.

On the day when an asteroid narrowly passes by Earth and a meteor shower falls, Seokwon, who has been searching for Jihyun for six years, tells him that the person he has been looking for no longer exists and warns him never to show up in his life again, disappearing.

Jihyun, chasing after Seokwon, regrets his choice that ruined Seokwon’s life. While watching the countless stars and the large moon, Jihyun wishes that if he could go back to that day, he could restore Seokwon’s life and make it whole again—before losing consciousness.

When he wakes up again, he is back at the age of 18, and Seokwon doesn’t yet know him. Jihyun struggles to prevent the mistakes of the past from repeating, but as if by fate, the two of them continue to be intertwined, and the events from before begin to unfold again…

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