A system for customizing soundtracks and hairstyles in modifiable videos of a multimedia messaging application (MMA) is provided. In one example embodiment, the system includes a processor and a memory storing processor-executable codes, wherein the processor is configured to receive, via the MMA, a modifiable video and an image of a user including an image of a face and an image of hair; determine that the image of hair is modifiable; modify the image of hair and generate a further image including the modified image of hair and the image of the face; generate, based on the further image and the modifiable video, a personalized video, wherein the personalized video includes a part of the further image of the user and a part of the modifiable video, and add a soundtrack to the personalized video based on predetermined criteria.