I'm sure I've seen that cutie Albert somewhere else, but I can't place him. Maybe it was Hawaii Five-O. That show frequently features Asian characters, including the hunky Ian Anthony Dale.
Ian Anthony Dale...now that's not an Asian actor's name I was expecting. (He was born in Minnesota!)
_______
John Harlan Kim was born in Australia. IMDB indicates he has been in two series as a regular. One I've not heard of. The Librarians I have heard of, but not seen. He was also in two episodes of Hawaii Five-0, which IMDB says were aired this year. He played Endo.
_______
From an article two days ago:
The Origin of Chimney's Nickname on '9-1-1' Remains the Show's Biggest MysteryBY ALLISON CACICH
Howie "Chimney" Han. The firefighter exudes positivity and is arguably the most loyal member of the 118, so when the show announced that he’d be getting his own origin story episode in Season 2 viewers were thrilled. After all, we still hadn’t heard how Chimney got his nickname.
Why is Chimney called Chimney on '9-1-1'?It’s been a year since the Chimney-centric episode aired and we still don’t know what exactly inspired the name. In Season 2, Episode 4, Henrietta "Hen" Wilson is about to tell the story to Christopher Diaz, but Chimney stops her. Later, she admits to reporter Taylor Kelly that the tale is "not one you can tell on TV." Interesting.
The article then has some fans speculating on what it means.
https://www.distractify.com/p/why-is-chimney-called-chimney-911