YouTube stars Sam Tsui and Casey Breves this week released a video to a new single that revolves around their big day.

Tsui, who is known for making covers of pop hits, came out gay and announced his engagement to fellow musician and collaborator Breves in a video posted in April. The couple married on April 16, one day after Tsui's public coming out, in Los Angeles.

On Thursday, the couple released the video for This Promise, an original song written by the pair, on Tsui's YouTube channel, which has more than 2.5 million followers. The video documents the couple's wedding day.

“It has been so awesome to share more of myself this year with all of you, and this video is perhaps one of the most special and personal I've shared with you yet,” Tsui wrote in the video's description. “As many of you know, I got married in April to the amazing Casey Breves, and wanted to share a little bit of that day with you because I really do consider you, the #Samily, to be a kind of family that means so much to me.”

“Please enjoy this virtual invitation to our wedding, and the single we wrote to accompany it – it's an anthem about the power and timelessness of love,” he added.