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Tsui was born on May 2, 1989. His father is from Hong Kong and of Cantonese descent, while his mother is an American from Iowa. He grew up in Blue Bell, Pennsylvania, a street away from Kurt Schneider, his producer and accompanist, with whom he attended Wissahickon High School. Tsui attended weekend Chinese school as a child and can speak some Cantonese.

On April 15, 2016, Tsui posted a coming out video on his YouTube channel in which he announced that he is gay and in a long-term relationship with fellow musician and collaborator Casey Breves. They met while they were both at Yale (Tsui a freshman and Breves a junior) and were both part of an a cappella group on campus. The couple got married on April 16, 2016.

Just a small town girl
Livin' in a lonely world
She took the midnight train
Goin' anywhere
Just a city boy
Born and raised in South Detroit
He took the midnight train
Goin' anywhere

A singer in a smokey room
A smell of wine and cheap perfume
For a smile they can share the night
It goes on and on and on and on

Strangers waiting
Up and down the boulevard
Their shadows searching
In the night
Streetlights, people
Livin' just to find emotion
Hidin', somewhere in the night

Workin' hard to get my fill
Everybody wants a thrill
Payin' anything to roll the dice
Just one more time
Some will win
Some will lose
Some were born to sing the blues
Oh, the movie never ends
It goes on and on and on and on

Strangers waiting
Up and down the boulevard
Their shadows searching
In the night
Streetlights, people
Livin' just to find emotion
Hidin', somewhere in the night

[Instrumental Interlude]

Don't stop believin'
Hold on to the feelin'
Streetlights, people
Don't stop believin'
Hold on
Streetlights, people