Pre-debut

All five members of B.I.G were trainees before becoming members of the group and have an average of three years training between them. Three of the group's members: Gunmin, Minpyo and Heedo, trained at the Plug In Music Academy.^[3] Benji had previously been a student at Cleveland Institute of Music and Heifetz International Music Institute,^[4] and later attended Juilliard School, before dropping out in 2011 to pursue a music career in South Korea.^[5] He has been playing violin since he was four years of age and was a member of the Seattle Youth Symphony. Before joining GH Entertainment, Minpyo had been a Stardom Entertainment trainee and member of Topp Dogg's trainee group, Underdogg. Before debuting the members practiced together as a group for one and a half years.

2014: Debut with "Hello" and "Are You Ready?"

On July 5, just days before B.I.G's debut, the group took to the streets of Myeongdong to perform.^[6] B.I.G's debut single, "Hello", and accompanying music video were released on July 9.^[7] The song garnered attention because of its high praising lyrics in regards to South Korea which highlight the culture and promote the country.^[8] The group performed their debut stage on SBS MTV's The Show on the day of their debut.

On October 16, B.I.G confirmed their second single, "Are You Ready?"'s upcoming release.^[9] The single was released on October 21.^[10] The group began promotions from October 22, with their comeback stage on MBC Music's Show Champion.^[11]

On December 12, B.I.G released their rendition of Wham!'s "Last Christmas" to thank their fans and celebrate their first Christmas as a group.^[12]

2015: "Between Night n Music" and "Taola"

B.I.G announced their third single, "Between Night n Music", on March 3, accompanied by a selection of individual and group teasers images.^[13] The new single and accompanying music video were released on March 6.^[14]

On November 4, GH Entertainment announced that B.I.G would be joining the long list of November comebacks.^[15] The single, Big Transformer, including the title track "Taola" was released on November 19.^[16]

2016: Japanese debut and Aphrodite

GH Entertainment confirmed in late January that B.I.G were preparing for their upcoming Japanese debut, with management from HY Entertainment.^[17] The group began promoting in Japan by holding showcases in Tokyo before their debut to help them become known.^[18] They officially debuted on March 23, with the Japanese version of "Taola", which peaked at number 15 on the Oricon weekly singles chart.^[19]

On May 10, B.I.G announced that their first mini-album, Aphrodite, would be released later that month.^[20] The mini-album and accompanying music video for title track of the same name, were released on May 17.^[21] Promotions for the album began on release day with a showcase on SBS MTV's The Show.

B.I.G held their first Japanese concerts, B.I.G Japan First Live, on June 17 and 18 at Harajuku's Astro Hall in Tokyo.^[22]

2017: "1.2.3" and Hello Hello

On February 3, 2017, B.I.G announced their return with the fifth single, "1.2.3".^[23] The single entitled "B.I.G Rebirth" was released on February 13.^[24] The group promoted the single without rapper Minpyo, who was taking a break due to health problems.^[25]

On May 15, B.I.G announced their sixth single, Hello Hello, would be released of May 23.^[26] B.I.G held their first concert in South Korea entitled B.I.G Asia Tour in Seoul, on June 24, at the KBS Arena in Seoul.^[27] On July 5, B.I.G introduced a campaign song entitled "Remember", they released the digital single on July 7.^[28] In September B.I.G embarked or their first tour of Asia named The B.I.Ginning in which they played venues in Manila and Yokohama.^[29] Later that month they conducted their first overseas tour, the B.I.G Special Latin Tour, in Brazil, Chile and Mexico.^[30]

2018–present: Addition of new member, Illusion, member departures and Mr. Big: Flashback

On November 15, 2018, the group's leader J-Hoon enlisted in the military.^[31]

On January 19, 2019, Jinseok was added to the group.^[31]

On November 4, 2019, the group released their seventh single, Illusion, in both Korean and Arabic, making them the first K-pop group to release a song in the language.^[32]

On September 30, 2020, Benji's contract with GH Entertainment ended and it was later announced that he had left the group.^[33]

On March 31, 2021, Minpyo's contract with GH Entertainment came to an end and it was later announced that he had left the group after choosing not to renew.^[34]

On August 10, 2021 B.I.G. and 3YE had a collaboration song titled "Presente." This group is known as Triple7.

On November 23, 2021, the group released their eighth single, Mr. Big: Flashback, which includes the single "Flashback".^[35]

Current

• J-Hoon (제이훈) – leader, vocalist^[36]
• Gunmin (건민) – vocalist, dancer^[36]
• Heedo (희도) – rapper^[36]
• Jinseok (진석) – vocalist^[36]

Former

• Benji (벤지) – vocalist^[36]
• Minpyo (민표) – rapper^[36]

Extended plays

Single albums

Singles

Soundtrack appearances

Reality shows

Music videos