[2] Yang became a JYP Entertainment trainee, but left after receiving a bad grade from practice reviews.

While still a trainee at Cube Entertainment, he became a backup dancer for AJ, his soon-to-be group member and former high school friend, now known as Lee Gi-kwang, in the music videos and live performances of "Wiping the Tears" and "Dancing Shoes".

[4] He released a digital single together with Dalmatian's Daniel titled "First Snow and First Kiss" [5] and participated in singing original sound tracks (OSTs) for various Korean dramas such as "Happy Birthday" for More Charming by the Day[6] and "I Cherish That Person" for My Princess.

[citation needed] On January 24, 2019, Yang began his mandatory military service as a conscripted police officer[8] and was discharged on August 30, 2020.

[citation needed] Along with fellow Beast member Junhyung, MC Lee Hyukjae, Moon Heejun (formerly of H.O.T.)

[10] On July 16, 2010, Yang participated in the official soundtrack of the Korean drama More Charming By The Day as part of its promotional campaign, with the song "Happy Birthday".

100 Points out of 100), along with other idols such as MBLAQ's Lee Joon, Secret's Hyoseong, T-ara's Soyeon, Miss A's Min, and Simon Dominic.

[citation needed] On September 27, 2011, KBS' 'Poseidon' released part one of their original soundtrack series which featured Yang’s vocals.

His song, "No", was a collaboration piece between Rado (of Huh Gak's "Hello") and production duo Ji In and Wontag, the men behind MBLAQ's latest releases.

[19] In December 2013, he starred as the title character in a Seoul production of Joseph and the Amazing Technicolor Dreamcoat and was mentioned in the New York Times.

[21] It was announced in March 2014 that Yang would be participating in the musical-remake of the 2004 hit romantic comedy drama series Full House as the lead character, Lee Young-jae.

[22] On September 20, 2021, Yang released his first studio album Chocolate Box, with "Brain" serving as the lead single.