Howard "Chimney" Han is a firefighter/paramedis at the 118 in Los Angeles. Chimney is engaged to Maddie Buckley, and they have a daughter together, Jee-Yun Buckley Han. He is best friends with Hen Wilson. 

Chimney Han is played by Kenneth Choi. 

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9-1-1 Quotes

Maddie: I guess I just want my little girl to have a normal family. You know, uncles and grandparents that she might actually know.
Buck: Well then maybe you shoulda got knocked up by a guy who has one of those.

Eddie: You're a badass under pressure, brother.
Buck: Me?
Eddie: Hell yeah. You can have my back any day.
Buck: Yeah. Or, you know, you could have mine.
Eddie: Deal.