you used to be my satellite (слэш)

One moment, darkness, stillness, silence. Then, the world comes alive once more. Cacophony of noises, the train rolling on tracks, people talking, laughing. Music from his headphones. Sunlight through the window. Smell of cologne, a teenage boy’s deodorant, stale air and flowery perfume of the grandma sitting a few rows ahead.
Yoo Joonghyuk is once again in that subway. It is familiar, but also foreign. A whole lifetime in the past. He blinks as the world descends into chaos.
or: Yoo Joonghyuk in his first regression, with all his memories from the 0th round, meets one Kim Dokja.
spoilers for up to the epilogue