5gjm999 成立於2020年夏天一個無聊的下午，突然很想吃在大埔中心樓梯轉角的生菜魚肉，於是發布了第一首單曲<生菜魚肉>。5gjm999是主唱Venus的IG帳戶，她想不到更好的名字，便一直使用。

由於懶得出門，Venus用logic pro x 與自己夾band。她使用電子琴和預設的drummer製作了不少歌曲，大部份的曲詞編混都是她一手包辦。歌曲圍繞著20代女生的三觀，訴說成長時遇到的衝擊。

風格不定，遊走在Hip Hop與Dream Pop 之間。人如其名，總是不知道在做甚麼。

5gjm999 was formed in the summer of 2020 in a bored afternoon when a sudden craving for "lettuce and fish" from a snack shop in the corner of the staircase in Tai Po Centre. Then, her first single was launched. The name "5gjm999" is the instagram account of the vocalist Venus, and she couldn't think of a better name, so she keeps using it.

As she was too lazy to leave home, Venus used a logic pro X to play band with herself, and she produced a number of songs using an electric piano and a default drummer, and did most of the songwriting and mixing. The songs revolve around the perspectives of Gen Z girls and the shocks encountered when growing up.

Her style is unpredictable, ranging between hip hop and dream pop. As her name suggests in Cantonese, she never knows what she's doing.