NCT's Mark recently appeared as a guest on Na Young Suk PD's new YouTube show, 'Bubble Bubble', following the release of his first solo album 'The Firstfruit'. During the episode, Mark and fellow artist Lee Young Ji had a cozy Haidilao meal at home with host Na Young Suk PD.

Mark shared that the last time he got irritated was when a member of the group left a cup out after using it, forgot about it, and took out another cup without cleaning up the first one. Even though he didn't confront the member, he would clean up the mess himself. Additionally, Mark humorously mentioned that in his mind, he decided that he couldn't marry that member.

Na Young Suk PD and Lee Young Ji resonated with Mark's sentiments and shared that they also silently label people in their heads. However, Mark mentioned that people can redeem themselves in his eyes by simple actions such as cleaning up the cup, showing that his standards aren't overly high.

In other news, Lee Young Ji greeted fans on April Fools' Day with a social media post.