So basically they switched bodies and now the mc went back in time in the alt timeline and lost his memories and jehee also went back in time to find the mc?
Yes on the switch bodies Game mc to alt mc. Then alt mc to game mc. Which makes them 2 in 1 body. Where the game mc is technically dead until our alt mc dies. That way our game mc becomes alt mc and repeat the cycle.
So basically they switched bodies and now the mc went back in time in the alt timeline and lost his memories and jehee also went back in time to find the mc?