[3] Hwarang, under the name Song Jae-won, competed on MBC's reality television competition Under Nineteen in 2018.

[7] In December 2020, he opened his official Twitter account, and performed a pre-opening stage at Big Hit NYEL Concert with the song "I&Credible.

"[8] On June 2, 2021, it was announced that Hanbin had left Belift Lab and signed an exclusive contract with Yuehua Entertainment.

[9] On June 8, 2021, Yue Hua Entertainment officially trademarked three names: Tempest, TPST, and 템페스트.

On October 4, Star News reported that Yue Hua would be debuting a new boy group in the second half of 2021.

On December 31, the group's official SNS accounts were opened along with the motion video of their logo and on January 3, 2022, teaser photos for the seven members were released.

On October 19, Yuehua Entertainment announced that Hwarang would undergo surgery for his injured shoulder and would be going on hiatus to recover.

[19] On February 25, Nippon Columbia announced that Tempest would debut in Japan with the first Japanese EP Bang!, on April 10.