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.

Tae-hyung gets assigned to work with Hyun-jin and Yoon-seong, while Hyun-jin learns of Tae-hyung's true feelings.