San-ha's sudden confession startles Ju-won. While she tries to deny any romance between them and stay as siblings, she is overcome with mixed feelings. Hae-jun jokingly suggests getting married to Ju-won, upsetting San-ha. Meanwhile, a surprise visit from Seo-hyun shocks Jung-jae as an unexpected turn of events takes place.

Hae-jun finds out that San-ha is struggling with insomnia and taking medication. So-hee comes to visit San-ha alone without telling Jung-hee and asks him to stay with her and Jung-hee. Dal keeps trying to hide her feelings for Hae-jun. Meanwhile, a big secret between Ju-won and San-ha is about to be revealed by none other than Hae-jun.