So, guess theyll live happily and undramatically ever after, yes?

Well, lets not write the end of this fairy tale with a quill pen just yet.

They had a lot going on in the first year of their relationship, you know?

This Is Us - Season 1

Ron Batzdorff/NBC

But there are definitely going to be some lows.

And just like life continues to throw curveballs, well see some of those early on in the season.

Do you thinkanybodyonThis Is Usis going to have an easy ride?

says Sullivan with a laugh, adding: Theyre trying to figure out what the next steps are.

Theyre getting down to brass tacks.

Dont miss PEOPLE and EWsThis Is UsLIVE viewing party!

Go toPeople.comandEW.comon Tuesday, Sept. 26 beginning 8 p.m.

There are often two strong reactions to adversity or to extreme pain in peoples life, says Sullivan.

And these experiences have given him a positive bent on most things.

That state of mind doesnt always win out, but he gives it his best.

Well see if theyre able to, says Sullivan.

I dont know if youve ever planned a wedding, but its super hard to do in 18 episodes.

Thats not enough time to plan a wedding.

Well see if they get there.

Season 2of This Is Us begins Sept. 26 at 9 p.m. ET/PT.