She rose to fame as the top contestant of iQiyi's survival reality program Youth With You 2, finishing first and becoming the center of the girl group The9.

In 2020, Xin finished first on iQiyi survival reality program Youth With You 2, leading to her debut as a member and the centre of The9.

[citation needed] Since Dec 2021, she started releasing her first full-length album ‘Xanadu’ that includes 10 songs with 10 MV of 10+ different dancing styles.

[9] In 2014, Xin was accepted to the Tianjin University of Sport, majoring in Music Recording in the College of Art & Culture.

[21] In March 2016, Xin participated in Zhejiang TV's Chinese girl group survival reality program Lady Bees (蜜蜂少女队).

[25][circular reference] On April 26, 2017, Xin released a single "Only Have Music Left" (穷得只剩音乐) with Evey Zhang and Teresa Tseng,[26] a promotional song in movie Hot Rival (热血情敌).

[32][33] On May 20, Liu released her first EP entitled Xin,[34][35] including "Hot Party",[36] "Feel Good",[32] "It's You" (就是你),[34] and "Don't Want to Miss You" (不要想念你).

[40] In November 2018, LadyBees released the single and mini-album entitled Queen Bee, in which Xin starred in minifilm "Girl Power Age".

She successfully advanced from Vanness Wu's audition with her popping performance but was eliminated at the seven to smoke battle in the fifth episode as the 49th place of the season.

[65] On June 5, 2020, "Beatholic" MV was released, featuring Japanese top street dance group KING OF SWAG.

[70] On September 20, Xin attended the Christian Dior fashion event, Designer of Dreams, performing "Hot party" and "Don't Want to Miss You" (不要想念你) at its private live concert.

[71] In the same month, she participated in a podcast documentary, The Nth Years of Intangible Cultural Heritage (非遗第N年), organized by China Central Radio and TV station.

[82] On February 9, 2021, Xin performed at the ShandongTV Spring Festival Gala with her solo "Hot Party" and "BiuBiu".

[83][84][85] On February 10, Xin was a special guest for Liu Qian's magic show on ZhejiangTV Spring Festival Comedy Gala with her teammates.

[86] On the same day, Kuaishou 2021 Orange vs White Talent Show was aired; Xin performed "Miss You 3000" (想见你想见你想见你) and "BiuBiu".

[87][88] On February 12, Xin collaborated with singer Mao Amin on HunanTV Global Overseas Chinese Spring Festival, performing "BiuBiu" and "Smiling at the Sight of You" (一见你就笑).

[91] From her interview with Global People [zh] and Harpers Bazaar-Vietnam Magazine,[91] this has been a deep interest of her since she grew up in one of the most ethnically diverse region of China.

In terms of dance MV, international dancers, including Acky (popping), Melvin Timtim (Hiphop), Tight Eyez (Krump), Aya Sato (Voguing), Lyle Beniga, Lachica, Galen Hooks, 1Million - Jinwoo & Youngbeen, and Kiel Tutin, led the choreography of each songs.

"Better" tops the Chinese music and MV charts, and has accumulated over millions of view on YouTube, Weibo, and Bilibili.

During an overlapping period of time, Xin also joined E-Pop of China as one of the lead artists to feat various electronic music producers, where she showcased a variety of skills beyond vocals in her performances., including Talkbox, B-box, and Djembe.

[94] After debuting as a member of LadyBees, China News commented that "Xin and the rest of Lady Bees are extremely energetic both in front of the camera and in real life.

[97] The newspaper highlighted Xin's embodiment of non-conforming beauty standards in an interview with Wu Han, a producer of Youth with You 2.

[97] In July 2020, Xin Liu's name was referenced as a positive androgynous role model in a viral social experiment video on anti-bullying.

[99] Her popularity was included as one of the "most significant cultural events and voices in 2020 which spotlighted women's issues in China in a positive push for change".

On September 5, 2016, Xin participated in "Music Radio 'I Want To Go To School' 1200 Education Aid in Action" charity event and fundraiser to support left-behind children in need.

On October 29, 2016, Xin performed in a roadshow organized by "Music Radio 'I Want To Go To School' 1200 Education Aid in Action" in Shanghai and sold autographed souvenirs during charity sales.

[100][101] In September 2018, Xin participated in the "Music Loves to Smile in School" charity event organized by Shanghai Hai Kang Bei Foundation to support children with autism spectrum disorder.

[100] On January 31, 2019, Xin participated in the "Charity Sale Celebrity Referrer" hosted by Xiantou Commonweal, selling personal items and donating all proceeds to designated charity project "Education Aid for Tibet", and contributing to the construction of the Hope Primary School located in Tibet, China.

[105] On September 9, 2020, Xin served as the Goodwill Ambassador of Renren Charity and participated in the "Good School" project organized by China Foundation for Poverty Alleviation.

[106] On January 18, 2021, Xin was invited by Southern Weekly and participated in the creation of the Beijing Contemporary Art Foundation (BCAF).