"Alone (One Person)" (Chinese: 一个人) is a song recorded by Chinese singer Lay (Zhang Yixing) which serves as the original soundtrack for the 2015 romantic comedy film Ex Files 2: The Backup Strikes Back.

It was released on October 7, 2015.

[1] Composed, arranged and lyrics written by Lay, "Alone" was officially released and disclosed to the public during a fan meeting at Shanghai Indoor Stadium which was coincidentally on his October 7, 2015 birthday.

"Alone" ranked #1 on Baidu Music Chart and #4 on Billboard's China V Chart.

[2]