According to TVLine, Brian Tee's Dr. Ethan Choi is leaving Chicago Med in the Dec. 7 episode, which is also the show's fall finale. While this is obviously devastating news, it's somewhat bittersweet as Ethan is definitely going out with a bang, or rather a bell. That's right! It's wedding bells for Ethan and April with the hospital staff as guests.
When April and Ethan met again at his father's grave, it helped solidify things for Ethan. The passing of his father gave Ethan some perspective into his relationship with April that has made things "easier this time around." The wedding might feel quick for everyone at Gaffney Medical Center, but it was a foregone conclusion once April and Ethan realized that neither of them had really moved on since they last saw each other.