It is "HymForTheWeekend" by Alan Walker and Coldplay. Starting at 2 minutes and 45 seconds, it is the background music of Douyin.

Alan Olav Walker, born on August 24, 1997 in Northamptonshire, England, is a Norwegian DJ and music producer. In November 2014, he made his debut by releasing his personal electronic music work "Fade" on YouTube. In December 2015, he released his first official single "Faded" through Sony Music. The song's MV has exceeded 1.2 billion views on YouTube. In June 2016, the electronic single "SingMeToSleep" with vocal accompaniment was released. On November 6 of the same year, he won the "Best Norwegian Artist" award at the MTV European Music Awards. On February 22, 2017, "Faded" was shortlisted for the "British Single of the Year" award at the 37th Brit Awards. In May of the same year, the first electronic music work "Tired" with male vocal accompaniment was released. In 2018, the first studio album "DifferentWorld" was released. On March 21, 2019, the summer promotion song "OnMyWay" for "Peace Elite" was released.