Seong-jin decides to go on a trip with her girlfriend Yu-mi for her stepmother Hye-jin, who is lonely after her father passed away.
She sees the sea, cooks meat at the pension, and has fun. She sings and plays at the pension karaoke, when a power outage occurs, and Hyejin and Yumi's bodies change.
Yumi and Hyejin comfort each other saying they will be fine soon, and decide to keep it a secret from Sungjin.
Seong-jin keeps skipping over Yu-mi, who has her Hye-jin's soul, but Hye-jin, who enters her Yu-mi's body, is uncomfortable. Seeing the two of them, immature Yu-mi, who entered Hye-jin's body, flirts with her, and Seong-jin is embarrassed to see her stepmother like that..
Will Hyejin and Yumi be able to return to their own bodies?