Soo-Ho and Hyun-Seo's piano lessons continue, with subtle flirtations and unresolved emotions bubbling under the surface. Kei's presence adds a new dynamic, as he collaborates with Soo-Ho on a music project and grows closer to Hyun-Seo. The ex-couple's past is further explored, hinting at the reasons behind their breakup. Hyun-Seo worries about Soo-Ho's health, while he becomes increasingly confused by his feelings.