[1] The group is composed of eight members: Youngbin, Inseong, Jaeyoon, Dawon, Zuho, Yoo Taeyang, Hwiyoung, and Chani.

[14][15] On December 22, SF9 released special digital single "So Beautiful", originally an OST of their interactive web-drama Click Your Heart.

[18] The Taiwanese version of their EP was released on March 10, which contains seven tracks with addition new Chinese-language single "Still My Lady".

[19] On March 25, SF9 successful held their first fanmeeting "Burning Fantasy" at Sungshin Women University with attended by 600 fans.

[20] On April 7, SF9 held their debut showcase in Japan with attended by 1,300 fans at Tsutaya O-EAST in Shibuya, Tokyo.

[21] On April 18, SF9 released their new EP, titled Breaking Sensation, which contains six track including the lead single "Easy Love".

Following the release of their EP, SF9 held a three-stop U.S. solo tour titled "2017 SF9 Be My Fantasy in U.S.A" stopping in Dallas, Seattle, and Boston during November.

[43] They were selected as the new CF models for Korean chicken joint Toreore,[44] On June 17, their seventh EP, RPM, was released with the lead single of the same name.

[47] Their first Korean studio album, First Collection, was released on January 7 with the lead single "Good Guy".

[60] SF9 participated in Kingdom: Legendary War, a competition show alongside five other K-pop boy groups, beginning in April 2021.

[63] Four months later, the prequel of 9lory worldview[64] EP Rumination was released on November 22, with the lead single "Trauma".

[67] From January 21–23, 2022, SF9 had 4 shows of their third solo concert "Live Fantasy 3: IMPERFECT" in the Olympic Hall, Seoul.

[69] On February 14, it was announced that Youngbin would also be enlisting for his mandatory military service on March 29, serving as an active-duty soldier at the 27th division of the army.

[74] On December 20, 2022, FNC announced that SF9 would be releasing their twelfth EP, The Piece OF9 on January 9, 2023, with Rowoon rejoining the 6 other members.

[75] On February 13, 2023, FNC announced that Jaeyoon would served his military service on March 21, where he would attend basic training at the 3rd Infantry Division.

[77] On December 18, 2023, FNC announced that SF9 would be releasing their thirteenth EP, Sequence on January 8, 2024, with Inseong and Youngbin rejoining the group after completing their respective military service.

[79] SF9 will release their fourteenth EP Fantasy on August 19, 2024 as a 5-member group, as currently active member Zuho will not be part of this album.