Ethan Choi USNR, is an emergency room third-year resident with an expertise in infectious diseases. He just returned stateside after serving on the USS Carl Vinson as a medical officer



Ethan is the son of a Navy veteran and has a younger sister, Emily. Ethan later followed in his father's footsteps and joined the Navy as a medic. While on duty during his time in the military, he and his team set up a medical aid camp. A woman then walked for miles to bring her three-year old daughter to them. He said that even though the girl had no scratches or injuries, she had died from explosion waves that ruptured her lung. After serving on the USS Carl Vinson , he returned to Chicago and became a ER Resident.


Ethan is shown to be one of the more emotionally-controlled residents at Gaffney Chicago Medical Center. Perhaps, this is because of his military training. While other doctors tend to show more emotion , Ethan tends to have a blank look on his face. After the death of Dr.Wheeler, Ethan gives everyone a pep-talk, and while everyone else is visibly sad. Ethan doesn't cry until seeing the body of Dr.Wheeler. Ethan cries into April's shoulder, after the mass-shooting, maybe setting off flashbacks from the war. He sees the world in black and white (again most likely due to his military-background), wanting what is best for the patient and often clashing with other doctors like Crockett Marcel over the treatment options. This becomes bad when his sister, Emily Choi is accused of stealing opioids from the hospital , by April , but Ethan won't believe April.

Season One



Ethan decides to force deliver a placenta stating that he had done it before, as OB service was busy. However, the procedure isn't well done and the 14 year old girl is left with almost having to go through a hysterectomy. He felt guilty about what happened, specially considering he judged the girl for abandoning the baby. He later tries to help the girl and she runs away from the Hospital. The morality of the situation arises discussions between him, Dr. Manning and Dr. Rhodes.


Will treats Gertrude Kovack, a patient that seems rather racist because of her comments toward April's ethnicity. She later spots Ethan outside her room and tells Will she would prefer him because "Orientals make the best doctors" relating it to stereotypical math skills. Ethan plays along and quotes Confucius. Will later mentions that Ethan is Korean.

Season Two

Love Hurts

Ethan and April kiss for the first time.

Season Three

Speak Your Truth

Ethan and April are officially a couple, but she wants to keep their romance on the down-low, especially since another nurse is already complaining about favoritism on Ethan's part.

Season Four

The Poison Inside Us

Ethan is poisoned after being trapped with a family member of one of his previous patients. The poison eventually spreads through the whole hospital but shown visibly affecting him, to the point of making him bedridden


  • (to Sarah):"We rise or fall together."


  • Dr. Choi has the blood type O-
  • Dr. Choi mainly care for patients with gunshot wounds in Baghdad
  • It is shown he got a parrot in Season 2 , to help with his PTSD
  • Dr.Choi is the only other character besides Jay Halstead, Jeff Clarke and Greg "Mouse" Gerwitz , in the entire One Chicago franchise with a miltary background.


Season 1 Appearances


















Season 2 Appearances
"Soul Care"

"Win Loss"

"Natural History"

"Brother's Keeper"

"Extreme Measures"

"Alternative Medicine"

"Inherent Bias"

"Free Will"

"Uncharted Territory"

"Heart Matters"

"Graveyard Shift"

"Mirror Mirror"

"Theseus' Ship"

"Cold Front"

"Lose Yourself"

"Prisoner's Dilemma"

"Monday Mourning"

"Lesson Learned"

"Ctrl Alt"

"Generation Gap"

"Deliver Us"

"White Butterflies"

"Love Hurts"

Season 3 Appearances
"Speak Your Truth"

"Nothing to Fear"

"Trust Your Gut"

"Naughty or Nice"

"Mountains And Molehills"

"Ties That Bind"

"Over Troubled Water"

"Lemons and Lemonade"

"On Shaky Ground"

"Down By Law"

"Folie à Deux"

"Born This Way"

"Best Laid Plans"

"Lock It Down"

"Devil In Disguise"

"An Inconvenient Truth"

"The Parent Trap"

"This Is Now"

"Crisis Of Confidence"

"The Tipping Point"

Season 4 Appearances
"Be My Better Half"

"When To Let Go"

"Heavy Is The Head"

"Backed Against The Wall"

"What You Don't Know"

"Lesser of Two Evils"

"The Poison Inside Us"

"Play By My Rules"

"Death Do Us Part"

"All The Lonely People"

"Who Can You Trust"

"The Things We Do"

"Ghosts in the Attic"

"Can't Unring That Bell"


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