The first broadcast of Do-re-mi-fa-SOLO-si do? is a success, and Soo Yong's name trends online. Eun Sung, having seen a vision of the Soo Yong and Hae Na kissing, is on high alert as she doesn't know when the incident will happen. Meanwhile she is overwhelmed by prep-work for the upcoming

Eun Sung is mortified after ruining Hae Na's prank for the variety show. On top of that, she is taken aback by Yun Woo's shocking comment. Tired from everything, Eun Sung tells Soo Yong to keep it professional, leading to an argument.