Diamond Zhang (张碧晨), known sometimes as Zhang Bichen/Bichen Zhang, was born on September 10, 1989, in Tianjin, China, and is a singer who originally debuted in South Korea as a member of the girl group Sunny Days (써니데이즈), and was part of the group when they debuted in 2012, but would leave in 2013, after winning the K-pop World Festival in China.

One year later, she competed as a contestant on The Voice China in 2014; she was also the winner of the competition. With her win on two singing competitions in China, she was able to debut as a soloist unofficialy, releasing the song 一吻之間 (Between a Kiss) – the OST for the drama 青年医生 (The Young Doctor).

She would later go on to appear on a variety of Chinese singing competitions, such as The Masked Singer China, Be The Idol, and Singer, Singer 2017 and I am a Singer, and also made her official debut with the EP 開往早晨的午夜 (Morning Bound for Midnight) in 2016. Zhang would also go on to continue releasing OSTs for dramas as well.

In late January of 2021, Zhang announced that she had given birth to a child – a girl – in 2019, and the child’s father was announced to be Hua Chenyu (華晨宇). Zhang and Hua Chenyu (華晨宇) were dating around the time she had discovered she was pregnant, but did not tell Hua Chenyu (華晨宇) nor the public as neither had plans for marriage or children at the time. However, when the news broke out, Hua Chenyu (華晨宇) acknowledged the existence of the child and the two agreed to co-parent without being married.