Yeun had called Pak an "MVP" while celebrating her birthday in October. He posted a photo of Pak sharing a moment with their son on a busy sidewalk.
FOLLOW REALITY TV WORLD ON THE ALL-NEW GOOGLE NEWS!
Reality TV World is now available on the all-new Google News app and website. Click here to visit our Google News page, and then click FOLLOW to add us as a news source!
"happy birthday to the mvp," the star wrote, adding a heart emoji.
Yeun played Glenn Rhee in Seasons 1-6 of "The Walking Dead" and was killed off in the Season 7 premiere.
He said in an interview with Slate in October that he felt "cramped" as an Asian-American actor in the role.
"It's like: nice guy, dependable, supportive, benign. Beige," the star explained.
"That was a little bit of the frustration that I could never explain to the wider society, to fans of the show."
"I felt like there wasn't enough space for me to fully spread all of who I was, and that was partly due to me, too, because when I started, all I was trying to do was to work within the parameters that they were giving me," he added.
Copyright 2018 United Press International, Inc. (UPI). Any reproduction, republication, redistribution and/or modification of any UPI content is expressly prohibited without UPI's prior written consent.