"Gu Family Book" Yoo Yeon Suk made a very powerful entrance into the drama.

In the 3rd episode of the MBC drama "Gu Family Book" features Park Tae Seo (Yoo Yeon Suk) trying to restrain Choi Kang Chi (Lee Seung Gi) when he becomes extremely angry when Bong Choon (Jo Jae Yoon) and the other men trespass.

Choi Kang Chi orders him to take care of things quietly since there are important guests present. However, when things begin to get out of hand, Park Tae Seo tries to take control with his powerful charisma.

When Bong Chool insults Choi Kang Chi, Park Tae Seo yells, "How dare you speak this way!" and worries about Choi Kang Chi's feelings getting hurt. When Bong Chool requests more money than the original amount agreed upon, Choi Kang Chi becomes furious. Park Tae Seo takes control by saying, "Shut your mouth, you're the one that made it 30 and not 20."

Then, Park Tae Seo hands Choi Kang Chi a pile of record books to check whether the calculations are correct. He adds, "I'm letting you go off easy because I care about you" with a mischievous expression on his face and let Choi Kang Chi know how much he cares.

Viewers responded with comments like, "Very cold but warm-hearted at the same time. Very attractive character", "Such a powerful presence in the drama" and "His care for Kang Chi is so touching."