No this is the third scenario/AU(don't know accurate words to describe it)
In season 1 we saw the whole tragedy of both of them
Season 2 we saw what if after all that what if our MC returns to the past with all the memories and has a short at reliving his life without regrets
And now the side stories are what if the ML kolf returns to a past where only he has memories of the first universe and here we are !!!
Hope that helps!!!

I read ts by skipping a few chapters,n the fuck is actually going on! Wasn't he dead?