The group SF9 is set to make a comeback, signaling a restrained luxury.

On Jan. 2, SF9’s agency FNC Entertainment released the music video teaser for "Good Guy," the title track of their first full-length album "FIRST COLLECTION," on their official SNS channel.

The teaser for the released music video begins with the opening of a social club where SF9 with "GOLDEN RATED" can be used. Each of the members is staring at the camera, reading books or drinking tea, wearing a colorless suit.

In addition, the new melodic song "Good Guy" of the Sins base will be played against the backdrop of the teaser, harmonizing with SF9’s luxurious and understated visuals, raising expectations for its comeback.

SF9’s first full-length album, "FIRST COLLECTION," released on January 7, features 10 colorful tracks that sum up the musical achievements that SF9 has achieved and presents a bright vision in the future.

The title song, "Good Guy," is a song with luxurious sound making and harmonized and trendy styles that expresses "Good Guy," which approaches its favorite opponent with confidence.

The full-length album of SF9’s first full-length album ‘FIRST COLLECTION’ was released on major music sites at 6 p.m. on January 7.