The group and individual members have also participated in various musicals, radio programs, web shows, TV series, and films.

On February 3, 2009, U-KISS released their second EP Bring It Back 2 Old School, with the lead single "I Like You", which gained them popularity especially in Thailand.

[22][23] U-KISS promoted the album in the Philippines through a series of mall shows, where they sold more than 1,000 copies in one day, breaking the record for the highest sales in a launch and earning a million pesos.

[24] Due to its success, the group had their first major concert in the Philippines, later released on DVD as U-KISS First Kiss Tour in Manila.

[40][41][42][43] It featured a special presentation by Soohyun singing a duet with Sistar's Hyolyn of "Love Always Finds a Reason", with the original English lyrics.

[61] On May 12, U-KISS became not only the first K-pop act, but also the first Asian group, to perform in Colombia at "Los 40 Principales" (the biggest pop concert in Latin America) along with Shakira.

[66][67] On July 29, it was announced during the Japanese Live Tour that AJ would be take hiatus for 5 months and would no longer attend U-KISS activities starting in August, in order to concentrate on his studies.

[69] Before AJ's temporary departure from the group, U-KISS attended the A-Nation opening ceremony at the Tokyo National Stadium on August 3.

[70] On August 9, 2012, U-KISS represented Korea in Asia Progress M, part of A-Nation, the biggest music festival in Japan.

[70][72] On September 5, the group ended their Japanese tour with the U-KISS Japan Live In Budokan (2012), where they attracted an audience of 10,000, their biggest to date.

[76] On September 20, the group released their seventh EP, Stop Girl, and planned to actively promote it in 10 countries including Thailand, the Philippines, the United States, and China.

[84] The sub-unit uBEAT debuted at the end of April, composed of Eli and AJ, with Kevin featuring as the main vocalist.

[7] Avex Trax announced that U-KISS would release their second full-length Japanese album, "Inside øf Me", on July 24.

It featured a special presentation by Soohyun singing a duet with Wanting Qu of "You Exist in My Song", with the original Chinese lyrics.

[89][90] On May 15, NH Media introduced new member Jun through U-KISS' official Korean website to replace the positions of AJ due hiatus for continued his studies at Columbia University.

[91] On June 2, Jun officially made his debut with U-KISS following the released their 9th EP, Mono Scandal, with the 19+ rated MV for lead single "Quit Playing".

[92] With this song, U-KISS become the first boy band to be temporarily banned from broadcast in South Korea for “inappropriate choreography”, causing them to make changes to the original dance routine.

[108][109] U-KISS contributed a song, "RUN A WAY", to the OST for KBS2's TV drama Manhole, which aired August–September and starred Jaejoong from JYJ.

[110] On August 20, 2017, U-KISS performed at The Star of Asia music festival in Kazakhstan, where they were presented with a special prize trophy during the broadcast on KAZAKH TV.

[111] On September 6, NH Media reported that Kiseop had suffered second degree burn injuries due to an explosion that took place during the group's "FLY" music video filming.

[114][115] U-KISS contributed an English-language cover version of Shakira's "Try Everything" (from the movie Zootopia) to the compilation album Thank You Disney, which was released on October 25.

[120] On March 31, 2018, U-KISS released their 7th Japanese full-length album, LINK, which included songs recorded by Soohyun before his enlistment.

[121] All the members of U-KISS (including Soohyun, who was on temporary leave from military duty) celebrated the 10th anniversary of their Korean debut.

[124] On December 19, U-KISS released their 8th Japanese full-length album, Glory, which featured a Christmas song for the title track.

[130] Kevin temporarily rejoined U-KISS as a duo with Soohyun as part of a special throwback-themed "Guilty Pleasures" concert from SBS and its variety show MMTG in October 2020.

Island and B2ST – held a special show called "Seoul-Osaka Music of Hearts", raising funds to help victims of the 2011 Japan earthquake.

[150][151] Earlier in March of that year, U-KISS had volunteered to take part in another fundraising concert put on by veteran Korean singers for the same cause, where they worked together with several boy and girl bands to answer donation phone calls.

[152] On June 18, 2012, U-KISS became the first K-pop group to hold a fan meeting in Cambodia, called "Share The Love Charity Concert".

The show, as a part of the benefit project, was sponsored by famous Cambodians and was even attended by the prime minister of Cambodia, Hun Sen.[153][9] On February 1, 2013, Soohyun and Kevin hosted a charity event for Jakarta after the heavy flooding in Indonesia.

[154][155][156] On June 6, 2016, U-KISS revealed that a portion of the proceeds from their Stalker album sales would be donated to the Culture and Arts Education Division of AbleArt Center, which helps handicapped artists.