As they navigate caring for Woo-joo, Tae-hyung makes an irresistible proposition to Hyun-jin and proposes cohabitating for a month.

As Hyun-jin and Tae-hyung's relationship deepens, Hyun-jin hides their living arrangement from her first love, Yoon-seong.

As Yoon-seong discovers Hyun-jin's secret, Tae-hyung learns that Yoon-seong was her first love.