SECHSKIES successfully concluded their 20th anniversary concert in Daegu on January 6.
On January 17, it was announced that YG Entertainment had successfully registered "SECHSKIES" with the Korea Intellectual Property Rights Information Service (KIPRIS) as an official trademark on April 24, 2017, allowing SECHSKIES members to exercise exclusive rights to the band name.
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Towards the end of December 2017, a teaser for the film SECHSKIES Eighteen was released.
The film release was officially announced on January 5.
The documentary follows SECHSKIES as they prepared for their fifth studio album Another Light; it was filmed using ScreenX technology and opened in select CGV theaters on January 18 in Seoul, Incheon, Jeju, Changwon and Yongin.
On January 9, tickets for a January 11 preview screening of the film sold out in 4 minutes.
According to the Korean Film Council, the film ranked first in seat sales for the month of February, selling 91.4% of seats available.
By March 25, over 50,000 tickets to SECHSKIES Eighteen were sold; to commemorate the milestone as well as the band's 21st anniversary, SECHSKIES announced that a "Fan Festival" would be held from April 1 to 15 across 7 cities (Seoul, Daejeon, Jeonju, Daegu, Ulsan, Gwangju, and Busan), offering free screenings of the 2016 Yellow Note concert, the 2017 Yellowkies Day fan event, and both New Kies shows (New Kies on the Busan and New Kies on the Honolulu) in collaboration with Danaflix.
On February 14, SECHSKIES received the Song of the Year - September award at the 7th Gaon Chart Music Awards for the title song "Something Special" from their fifth album Another Light.
On May 28, at the request of Yellowkies, Ko Ji-yong was removed from SECHSKIES profile by YG Entertainment.
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