The group is composed of members Sangyeon, Jacob, Younghoon, Hyunjae, Juyeon, Kevin, New, Q, Ju Haknyeon, Sunwoo, and Eric.

[9] From August 23 to October 11, their first reality show Flower Snack aired, resulting in the release of the song "I'm Your Boy".

[14][15] On December 4, Cre.ker Entertainment confirmed that the group had signed a contract with Sony Music for their Japan promotions.

[23] Due to health problems, Hwall couldn't promote with the group and subsequently had to halt all activities for three months.

[24] The twelve members, with Hwall back from his hiatus, released a special digital single titled "Keeper" on July 12, which was produced by Block B's Park Kyung.

[34] On October 23, Hwall officially left the group due to health issues and pursued a solo and acting career afterwards.

[35] On November 6, The Boyz officially debuted in Japan with the release of their first Japanese extended play Tattoo and its lead single with the same name.

[36] On December 6, the group released a special digital single titled "White (화이트)" to commemorate their second anniversary.

[39] On March 20, it was announced that the group will join Mnet's reality television competition Road to Kingdom.

The group eventually finished in first place, winning the show and securing a spot in upcoming Mnet program Kingdom: Legendary War.

[44][45] The Boyz participated in Kingdom: Legendary War, starting from April, where the group finished in second place.

[47] They released their sixth extended play Thrill-ing on August 9, with the lead single "Thrill Ride" was described as a trendy hip-hop.

[57] On December 6, the group released a special digital single titled "Candles", to commemorate their fourth anniversary.