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... Meanwhile, Kang-mi is embarrassed when her kiss partner from her dream last night appears before her eyes. A newbie suddenly joins Marketing Team 3 - Baek Ma-tan. But this newbie, is he... "new"?