The opening interlude is "His Smile", which belongs to the album: Love Letter (Love Letter) OST. It is a very beautiful and very sad piece of music. His sadness was the kind of sadness that was hard to suppress, and he couldn't stop talking about it.

The movie "Love Letter" is a Japanese pure love movie written and directed by Shunji Iwai. After its release, it caused a sensation not only in Japan but throughout Southeast Asia and even Europe and the United States with its fresh and touching story and bright and beautiful images. , regarded by many film critics as one of the most important works in the Japanese New Film Movement; this film is adapted from the novel "Love Letter" of the same name. The heroine of the film, Mie Nakayama, is the heroine Yamada of the classic action film "Fist of Heroes" starring Jet Li. Mitsuko plays the sister of Shinobu Nakayama.