Marketing Team 3's Official Troublemaker Lee Sang-shik. He has hit trouble. The video commemorating Gaus' 50th anniversary, which he only posted on his private channel, has been made available to the public without his knowledge. The small ball fired by Sang-shik, along with the chairman's summons to the prosecution, is causing a bloody wind that puts Marketing Team 3 on the verge of dissolution.

The enemies meet at work, not on a single-log bridge. Cha Na-rae and Lee Sang-shik, who despise each other, not only sits next to each other at work but also lives next door to each other. Na-rae and Sang-shik were more thorough in drawing lines than the 38th Parallel. Something happens to those who cross the line.

Of all days. The day Sang-shik decides to make his 10th confession of love to Hae-young, whom he's had a crush on for five years, Hae-young sees him hugging her next-door neighbor, Na-rae. Sang-shik begs Na-rae to clear up the misunderstanding, but when she explains to Hae-young, she hears a shocking fact... Meanwhile, Sang-shik prepares to confess his love. Will it turn out okay?

There are also trees that were stamped ten times but did not fall over. Sang-shik knows that Hae-young has a boyfriend and wants to smoothen everything up... He confesses to Hae-young. Meanwhile, Kang-mi overhears that Ma-tan is the successor to Power. Ma-tan gets nervous when he sees that Kang-mi's mouth, which she says is heavier than steel, is as light as a feather.

If Sang-shik and Na-rae don't fight for a day, they get thorns in their mouths. Why are there so many things going on today? At the office, Na-rae hears that Sang-shik has a new person he loves. When she heard it, she believes it's her. Does Sang-shik really like Na-rae? Meanwhile, Manager Wi, a kirogi father, deeply misses his family.

Na-rae is annoyed at herself for liking Sang-shik, but whenever she sticks with him, she gets double nosebleeds, bruises all over her body, and now even a cast. Na-rae gives Sang-shik a restraining order because she thinks she might die. While receiving nursing care from Aziz, Na-rae is surprised to find something.