The Goddess, Wendy.

2015–2020: Solo activities

Wendy collaborated with rapper Yuk Jidam for the song "Return", which is part of the OST of KBS2's Who Are You: School 2015. The song was released on June 8, 2015, and debuted at number 31 on the Gaon Digital Chart. She released another song "Let You Know" for the soundtrack of the JTBC drama D-Day on October 16.

In January 2016, Wendy became a long-term panelist on We Got Married and participated in King of Mask Singer as a contestant under the alias "Space Beauty Maetel". In March 2016, she collaborated with Eric Nam on a duet titled "Spring Love", as part of SM Entertainment's SM Station project. The song peaked at number 7 on South Korea's Gaon Digital Chart. In July 2016, Wendy and her Red Velvet bandmate Seulgi released an original soundtrack titled "Don't Push Me" for the TV drama series Uncontrollably Fond. In October 2016, she became a fixed panelist for the KBS show Trick & True together with her bandmate Irene. In December 2016, Wendy participated in two other singles for the SM Station project, "Have Yourself a Merry Little Christmas", featuring pianist Moon Jung-Jae and violinist Nile Lee, and "Sound of Your Heart", a collaboration with several SM Entertainment artists. In the same month, she was featured in the English version of Latin pop star Ricky Martin's single "Vente Pa' Ca".

Wendy released the song "I Can Only See You" with Seulgi in January 2017 for the OST of the KBS2 TV series, Hwarang. In February, she sang the Korean version of "My Time" which is part of Disney Channel's Elena of Avalor's official soundtrack and also appeared in its music video. In the same month, she became the host of the KBS World show K-Rush. On October 27, she, along with Kangta and Seulgi, released a remake of the 2001 song "인형 (Doll)" by Shinhwa's Shin Hye-sung and Lee Ji-hoon as part of the second season of the SM Station project. Its music video used footage from their live performance of the song at the SMTOWN LIVE TOUR V in JAPAN and was released on the same day. She released a duet with Baek A-Yeon on December 2, called "The Little Match Girl". In February 2018, Wendy was chosen as the interactive holographic avatar of SK Telecom's new AI voice assistant speaker, 'Holobox'.

In June 2018, Wendy was announced filming in Austria with Seulgi for Battle Trip's special episode themed 'The Country I Want to Live in'. In July 2018, Wendy collaborated with Yang Da-il for the single "One Summer" which was released on July 2. In October, it was announced that Wendy was set to release an English duet with American singer John Legend entitled "Written in the Stars" as part of the third season of SM Station, Station x 0 which would be Wendy's sixth time to participate in the project. The music video for the duet was released on October 19, 2018, on YouTube. In November 2018, Wendy released the song "Goodbye" for the soundtrack of JTBC drama The Beauty Inside.

On February 22, 2019, Wendy released the solo soundtrack, "What If Love", for tvN's drama Touch Your Heart. In October, Wendy participated once again in King of Mask Singer, under the alias 'Green Witch'.

In March 2020, Wendy had her first public schedule since suffering an accident in December 2019, with an appearance on MBC Standard FM's Listen To Books. In the same month, Wendy was confirmed to take part as a main voice actress for the Korean release of DreamWorks animated film Trolls: World Tour. It was released in April. In May 2020, Wendy collaborated with Zico for the OST of The King: Eternal Monarch titled "My Day Is Full Of You". In November 2020, aside from Red Velvet's OST "Future" for the drama Start-Up, Wendy also had a solo OST named "Two Words". In the same month, Wendy featured in labelmate Taemin's "Be Your Enemy", which was included in his studio album Never Gonna Dance Again.

2021–present: Return from hiatus and solo debut

In January 2021, Wendy made her official return to television as a co-host of Mysterious Record Shop. In March 2021, it was announced that Wendy would be making her debut as a solo artist with an album releasing in April. This was later confirmed as her first EP Like Water, which contains a total of five songs and was released on April 5.

On December 27, 2021, Wendy was revealed as a member of the supergroup Got the Beat alongside Red Velvet groupmate Seulgi. The group debuted on January 3, 2022.