The episodes of "The Unknown" are "Light", "The Blind Man", "The Unknown", "Wait a Wait", "Hu Guangsheng" and "Taishan Next Door".

Every interlude is in the film, and is played when it is needed most, which plays a role in setting off the atmosphere and increasing the emotional effect. For example, "Light" is sung by Chen Li. In the film, Glasses and Big Head are the background music when taking photos of Ma Jiaqi. The scene at that time and this music make people feel happy and happy.

"Blind Man" was sung by Yao Shisan, and Yao Shisan wrote and sang the lyrics. It was adapted from "Yulin Ling", and "Yulin Ling" is Liu Yong's work. This song It gives people a picture of a lover who is reluctant to leave but still wants to leave. It gives people an immersive feeling and can feel the desolation and desolation of that scene. And this song "Blind Man" is also the song used in the climax of the film. It drives the plot of the entire film with a heavy and sad tune, bringing the atmosphere to a climax.

"The Unknown One" was sung by Wang Sulong. It is the ending song in the film and brings an end to the entire film. "Wait a Wait" is sung by Ren Suxi and is the promotional song for this film. "Tarzan Next Door", sung by Arirang, is the background music used in a video where the big head and glasses in the film were parodied by netizens. It is full of cheerful and parody tone, and brings a laugh point to the film.