I know the quality of David Shores writing and I wanted to do it justice, Kim tells EW.

Because of that, I felt a little bit more butterflies in my stomach than I expected.

That familiarity made things easier for Highmore, too.

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David Bukach/ABC

We last saw Kim as Detective Chin Ho Kellyon CBSHawaii Five-0, which he starred on for sevenseasons.

The series went through a development cycle at CBS Studios, but it didnt move past the script stage.

Eventually,Housecreator David Shore came on board, and that changed everything, Kim told EW inOct.

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David Bukach/ABC

2017.Once Davids involvement was known to people, we pitched it again.

We had a very different reception, it moved forward, and four years later, here we are.

Kim and Shore had several discussions about wanting the actor to appear on the show.

We wanted it to be organic to the show and not just stunt casting.

It happened to fit my schedule availability-wise and there was a natural storyline.

Hes not keen on Shaun, Highmore tells EW.

Adds Kim: Jackson Han is someone who represents the challenges he may face in the future.

When Kim started shooting, he was surprised by how intense the role was.

I didnt realize how long and grueling [the surgery scenes] could be.

So those days can seem like they drag on for a while, he says.

Thankfully, his fellow castmates gave him some helpful advice.

Little things like that I really appreciated, he says.

Of course, the medical jargon is something that theres no hack for.

You just have to learn it.

The Good Doctorairs Mondays at 10 p.m. on ABC.