Actor Jung HaeIn is apparently a direct descendant of Jeong Yak-yong... He certified the Taegeukgi on March 1st Independence Day.

Actor Jung HaeIn celebrated the March 1st Independence Day by uploading a photo of the Taegeukgi. On the 1st, Jung HaeIn posted on his Instagram
He posted a photo of the Taegeukgi on Stories. Jung HaeIn is the 6th generation direct descendant of Dasan Jeong Yak-yong.
It is Grandson. That is why he shows extraordinary patriotism towards Korean history.
When appearing on "BLOCK," Jung HaeIn said, "I am the second son of Master Jeong Yak-yong," and "Since I was young, I have known my real grandmother and grandfather.
"I lived with them, so I heard a lot about them. That's when I started looking again. I remembered the teachings and footsteps of my ancestors and felt a sense of pride."
Jo Se-ho then asked, "Did you think you had to be careful about your behavior?" Jung Hae-in replied, "No matter what,
That's what I thought. (Even on YouTube) there were a lot of posts related to my algorithm," he said. "I was able to think about the letters and writings of Dr. Jeong Yak-yong.
"It's a lot of work. Thanks to these algorithms, we feel like we're getting closer to the lives of our ancestors," he added.
Meanwhile, Jung HaeIn will be appearing on MBC variety show "Good
"Good Day" is produced by G-DRAGON (BIGBANG), an icon of the times, and is a program that aims to make the year shine.
This is a music project program in which people from various fields create songs that will go down in history as memorable songs for the year, and it airs every Sunday at 9:10 p.m.