Kim dives in to recall childhood memories that always make him smile and happy when he remembers that memory. At University, Rain lets Payu cool down simultaneously; Baibua brings Payu stuff and sees the moment while Rain and Payu are cooling down for each other. At the music club, Prof. Wannasingh called an urgent meeting about the classical guitarist who had an accident. As a result, the music club had to cancel the show at the closing of the ruby ceremony. Meanwhile, Sun accidentally enters the music club room. And something happens.