A top detective in the violent crimes department suddenly becomes the guardian of his 6-month-old niece.

Jung Han attends a baby yoga class while Ye Seul tries to get him a private lesson.

Meanwhile, Mrs. Ma Jung-soon, Jung han's grandmother visits Jung han's home, telling him that she has wanted to see the baby Eun ae. But Eun ae and Jung soon disappear together. And Ye seul bumps into Jung han while she has been struggling for parenting.

Ji young and Ye seul have a big fight over child issues and Jung han tries to comfort Ye seul but this attempt leads to misunderstanding. Meanwhile, Ji young known as an expert in parenting devises a scheme to kick Ye seul's son Hoon gu out of the kindergarten but fails in convincing other mothers.

Han Sa-Jang, who wants to help Ye Seul, teams up with Jung Han.

Ye Seul rejects Jung Han's proposal and their relationship drifts apart.