spoiler from the novel
the way they isekaid is different and this was explained by the ml when they both have returned to the present. so, ml and mc met in the present—the time when mc got into an accident after winning the lottery. ml ‘traveled’ back to his past, memories of his present are intact, so he’s basically a 30 something hear old here. jaewon entered dojoon’s past too when he’s 23 iirc.

ik most readers must be confused as well. i picked this up again after a while and i remember this being a story where both the mc and ml isekaid or regressed? when they have sex the ml even says something about his body development at that age? but in his pov we don't really find anything confirming that?