Douyin’s two-dimensional transformation music is called “Ultramarine”. According to relevant public information inquiries, netizens used "Ultramarine" as the background music for the two-dimensional transformation. "Ultramarine" is a Japanese song. The singer is YOASOBI. The lyrics are translated into Chinese as "As usual, yawning at the passing days, passing through the noisy night, the morning is still coming today, falling on the streets of Shibuya." .