In January 2015, Xiumin made his musical theatre debut, playing the character of Aquila in the SM Entertainment musical School OZ alongside labelmates Changmin, Key, Luna, Suho and Seulgi.
In October 2015, Xiumin played the leading role opposite actress Kim So-eun in the web drama Falling for Challenge.
He also released his first solo song since debut titled "You Are the One" as a soundtrack of the web drama.
Falling for Challenge was the most watched web drama in South Korea in 2015, reaching 20 million views just after 17 days.

In February 2016, Xiumin was featured in AOA member Jimin's solo single "Call You Bae", and appeared in its music video.
In July 2016, he made his big screen debut alongside Yoo Seung-ho in the South Korean film Seondal: The Man Who Sells the River.
In August 2016, he collaborated with fellow Exo members Chen, and Baekhyun on an original soundtrack titled "For You" for the television series Moon Lovers: Scarlet Heart Ryeo.
In October 2016, together with Chen and Baekhyun, Xiumin became a member of Exo's first official sub unit Exo-CBX.
The group made their debut with the extended play Hey Mama!
on October 31.

In July 2017, Xiumin collaborated with NCT member Mark on a single titled "Young & Free" for S.M. Entertainment's digital music project Station.
In August, he became a regular cast member on the MBC reality TV show It's Dangerous Beyond The Blankets.

Xiumin enlisted for his mandatory military service on May 7, 2019, serving active duty.
He performed his final concerts before his enlistment with Exo-CBX's Magical Circus - Special Edition concert in Japan, and his solo fan meeting concert, Xiuweet Time, at Jamsil Arena on May 4.
Following his enlistment, he released his debut solo single, "You", which is part of SM Station, on May 9.
In August 2019, it was reported that Xiumin would be starring in an army musical titled "Return: The Promise of That Day" together with Shinee member Onew and Yoon Ji-sung, which ran from October 22 to December 1 at the Olympic Park’s Woori Art Hall in Seoul.
In January 2015, Xiumin made his musical theatre debut, playing the character of Aquila in the SM Entertainment musical School OZ alongside labelmates Changmin, Key, Luna, Suho and Seulgi. In October 2015, Xiumin played the leading role opposite actress Kim So-eun in the web drama Falling for Challenge. He also released his first solo song since debut titled "You Are the One" as a soundtrack of the web drama. Falling for Challenge was the most watched web drama in South Korea in 2015, reaching 20 million views just after 17 days.
In February 2016, Xiumin was featured in AOA member Jimin's solo single "Call You Bae", and appeared in its music video. In July 2016, he made his big screen debut alongside Yoo Seung-ho in the South Korean film Seondal: The Man Who Sells the River. In August 2016, he collaborated with fellow Exo members Chen, and Baekhyun on an original soundtrack titled "For You" for the television series Moon Lovers: Scarlet Heart Ryeo. In October 2016, together with Chen and Baekhyun, Xiumin became a member of Exo's first official sub unit Exo-CBX. The group made their debut with the extended play Hey Mama! on October 31.
In July 2017, Xiumin collaborated with NCT member Mark on a single titled "Young & Free" for S.M. Entertainment's digital music project Station. In August, he became a regular cast member on the MBC reality TV show It's Dangerous Beyond The Blankets.
Xiumin enlisted for his mandatory military service on May 7, 2019, serving active duty. He performed his final concerts before his enlistment with Exo-CBX's Magical Circus - Special Edition concert in Japan, and his solo fan meeting concert, Xiuweet Time, at Jamsil Arena on May 4. Following his enlistment, he released his debut solo single, "You", which is part of SM Station, on May 9. In August 2019, it was reported that Xiumin would be starring in an army musical titled "Return: The Promise of That Day" together with Shinee member Onew and Yoon Ji-sung, which ran from October 22 to December 1 at the Olympic Park’s Woori Art Hall in Seoul.
Xiumin