"How much of the agreement you made at that time do you still remember?" "I didn't expect to see you here again." "I was sorry for you when I was a senior in high school." "Actually, I remember everything. "7224 Kilometers was our future, but now it's just the distance between you and me. Two high school students with very different backgrounds who should not have intersected, got closer and closer with each other's help. Paper cannot wrap up fire, but moths will always fly into it. Song Lin left without saying goodbye, but Song Tianyun never forgot him. Do you believe that if you keep your faith in mind, there will be repercussions? The two met again 7224 kilometers away from the place where they first met. What was the truth back then?
Concept: The two boys each had their own difficulties. After helping each other again and again, they saw each other's truest and most vulnerable side, and they became sympathetic to each other. Due to an accident in their senior year of high school, the two broke off contact until they met again in Germany a few years later and renewed their relationship.