[1][9] This aggressive style with "tracks centred around loud, clattering, electronic instrumentals, vicious rap verses, and striking vocals" had also been influential across the fourth generation of K-pop,[10] along with breaking gender norms before it was a trend.

[16] No.Mercy also led to the 2014 spin-off web series Deokspatch, which also began airing in December, which was meant to showcase a more casual and lighthearted side to the competition in order for people to get to know the trainees better.

The title song "Shine Forever" combines future bass and hip-hop styles and includes rap lyrics written by members Jooheon and I.M.

[72] In April, their agency Starship Entertainment, announced their third world tour We Are Here with twelve countries and eighteen cities, making it their largest to date.

[78] On October 31, Starship Entertainment publicly declared that member Wonho will be departing, following recent allegations for drug use and owed money, and that the company intends to "hold legal liability" for "malicious and distorted claims" about him.

[99] They held their concert through the music streaming platform LiveXLive and performed several songs from their English-language album All About Luv, as well as several from their most recent Korean EP Fantasia X and several older title tracks.

[105] In January, the group was also announced to be one of the artists featuring on NCSoft's new platform Universe, beginning with an original series called Area 51: The Code.

[112] On June 15, Monsta X's American manager Eshy Gazit announced the launch of a new label venture Intertwine in partnership with BMG.

The venture also finalized a separate distribution deal, in partnership with Starship Entertainment, for Monsta X's two upcoming Korean releases, as well as confirming their second English-language album in 2021.

[143] On October 22, Monsta X was supposed to headline Nickelodeon's NickFest: The Messiest Music Festival Ever, to be held at the Rose Bowl in Pasadena, California,[144] but it was cancelled due to "current market conditions".

[149][150] In February, all Starship Entertainment's artists, including Monsta X, will be part of the mobile application Dear U bubble after the closing of Universe.

[151] On February 10, the group took over the metaverse in iHeartLand's State Farm Park, performing their hit songs, where several other artists, including Charlie Puth, Lauv, and Pentatonix participated.

[155] On April 21, Monsta X attended and performed in the We Bridge Music Festival & Expo, held at the Mandalay Bay Convention Center's Michelob Ultra Arena in Las Vegas, Nevada, as its headliner.

[164] On January 22, it was revealed that the B-side track "Beastmode", from their third studio album Fatal Love, was used as an ending theme song for the South Korean animated film Exorcism Chronicles: The Beginning.

[1][9] Philip Merrill described their sound for the Grammy's news publication as distinct in the K-pop scene with Monsta X "adding their Korean eclectic backgrounds to a meld between American rap, rock, and pop, they bring a throbbing rhythmic bounce, lyrics hard enough to slide in raps at will, melodies pop enough to hold you, all with a rock edge as the greater context".

[167] The group's aggressive style with "tracks centred around loud, clattering, electronic instrumentals, vicious rap verses and striking vocals" had been influential across the fourth generation of K-pop.

[171][172][173] The group also cited various international artists as their musical influences including Michael Jackson,[173][174] Chris Brown,[173] and Bruno Mars.

[177] As they were inspired to go in a new direction to show the many sides of love, Monsta X released All About Luv, which explores the elements of relationships, dealing with breakups and deceit.

[196] They also appeared and performed at the Time 100 Talks where they also voiced support for the Black Lives Matter movement, as well as drawing attention to the work of medical professionals during the ongoing COVID-19 pandemic.

[205] Tony Moly also attributed its stock price rise to the group's explosive popularity among the overseas K-pop fans, especially in Thailand, the largest cosmetics market in ASEAN.

[208] In 2019, an official statement from Kakao M revealed that Monsta X received 7,906 shares (about ₩1,000,000,000) of it to resolve issue rights to strengthen solidarity with affiliates and entertainers.

[213] Monsta X's music had influenced various artists including Myteen,[214] Verivery,[215] DKZ,[216] Newkidd,[217] OnlyOneOf,[218] DKB,[219] Cravity,[220] WEi,[221] Ciipher,[222] Trendz,[223] and TAN,[224] as well as A.C.E's Chan,[225] Drippin's Junho,[226] Kingdom's Dann and Mujin,[227][228] and Xodiac's Wain.

[231] The group also reached a career high for number of music program wins, a total of five trophies, with their single "Rush Hour".

[244] In May 2018, Monsta X attended the largest urban cultural festival C-Festival 2018 as its public relations ambassador for promotion, held by the Ministry of Foreign Affairs, Embassy of Thailand (Embassy of the Republic of Korea), Gangnam-gu, Korea International Trade Association, and COEX MICE Cluster Committee, hosted by COEX and WTC Seoul.

[252] In August 2016, the group became advertising models for the Korean telecommunications company KT's rate plan Y-Teen by releasing various contents to appeal to teenagers as its main target.

[260][261] On October 4, they partnered with the French-founded Italian luxury fashion design house Moncler, with the new flagship store of the company in Minato, Tokyo.

[141] Starting in August 2023, Monsta X received several product placement through their own reality/variety show including Luna Fall in Jeju Island and Lotte Chilsung Beverage's Chum Churum Saero soju.

[279] On April 6, they joined the Sports Doctors' "Relay Support Campaign", an international health care organization that encourages medical staff and citizens in Korea, as well as around the world who are struggling with COVID-19.

[282] In August 2021, Monsta X participated in the 2020 Tokyo Paralympic Games support K-pop online concert We All Are One to cheer for all 4,400 athletes from 181 countries through Red Angel's own streaming service Cushion Live, wherein the proceeds are virtuously circulated through The Salvation Army to global donation projects.

[283] In July 2022, Starship Entertainment, together with the group, participated in The Blue Tree Foundation's campaign, to declare support for non-violence, along with this label's other artists.