which marked their first group activity in four years. 2022–present: 15th anniversary reunion, and Forever 1 In May 2022, SM Entertainment announced that Girls' Generation would have a full-group comeback for their fifteenth anniversary, ending their five-year hiatus. To commence the anniversary promotion, the group took part in an 8-episode reality show, Soshi TamTam, which began airing on JTBC in July. Their seventh Korean-language studio album, Forever 1, was released in August 2022, peaking at number two on the Circle Chart. The group performed at the SM Town Live 2022 concert during the same month, and also held a sold-out special event "Long Lasting Love" in September 2022. Subgroup and solo endeavors In April 2012, SM Entertainment formed a subgroup of Girls' Generation named TTS (or TaeTiSeo), composed of three members: Taeyeon, Tiffany, and Seohyun. TTS has released three extended plays: Twinkle (May 2012), Holler (September 2014), and Dear Santa (December 2015). In August 2018, SM Entertainment formed the second subgroup of Girls' Generation named Girls' Generation-Oh!GG, composed of five members: Sunny, Taeyeon, Yoona, Yuri and Hyoyeon. They released their debut single album, Lil' Touch, on September 5. Taeyeon was the first member of Girls' Generation to debut as a solo singer; her debut EP I was released in October 2015, which peaked at number two on the Gaon Album Chart. Taeyeon's second EP, Why (2016), peaked atop the Gaon Album Chart. She has released three studio albums, My Voice (2017), Purpose (2019), and INVU (2022), and three further EPs, This Christmas: Winter Is Coming (2017), Something New (2018), and Voice (2019). Tiffany was the second member to debut as a solo singer, releasing her debut EP I Just Wanna Dance in May 2016. After leaving SM Entertainment, Tiffany released her second EP, Lips on Lips, in February 2019. Seohyun followed with her debut EP, Don't Say No, in January 2017. Yuri and Yoona also released their debut EPs titled The First Scene (2018) and A Walk to Remember (2019), respectively. Since 2016, Hyoyeon has also released several solo singles both under her given name and her DJ Hyo moniker. In May 2022, Hyoyeon released her debut EP Deep. In December 2018, Sooyoung released "Winter Breath", her first solo single since departing from SM Entertainment. Since 2017, the members began exploring their individual careers and have branched out into various entertainment fields. The range of activities include roles in movies,