On February 21 episode of tvN's television show 'The Must-try Restaurants', Yoon Jong-hoon made a surprise appearance.
In this episode, the host Park Na-rae, YouTuber Haetnim and chef Jung Ri-na went to one popular pho restaurant in Gangnam.
They waited for about an hour to get in, and they ordered the restaurant's signature menu―spicy pho with tripe.

Haetnim commented, "Wow, he really shines among everyone here, doesn't he?"
Then, Park Na-rae responded in a surprised tone of voice, "What? Who is it? Jong-hoon?!"
She looked at her phone and stated, "Oh, he messaged me just a short while ago! He said, 'Are you enjoying the pho with tripe?'"

Luckily, Yoon Jong-hoon saw this right away, and gave her the thumb up back with a big smile.
Jung Ri-na said, "I wonder if he lined up as well.", which Park Na-rae responded, "I'm sure he did, too."
Then, the production team found out Yoon Jong-hoon had waited outside for just over half an hour before he entered the restaurant.

(SBS Star)