LIGHTSUM is an 8-member girl group under Cube Entertainment scheduled to debut in the first half of 2021. LIGHTSUM, which is preparing for its debut, is a compound word of 'LIGHT' and'SUM' (to gather), meaning that 'as if everything that shines small to light up the world, delivers greater positive energy with a message of hope'.
The released video begins with the back of a girl walking toward a place where light is pouring in a dark space. Afterward, LIGHTSUM members appear one after another along with props such as plants, mirrors, telescopes, and skateboards in a place full of a fairy tale atmosphere.
At the end of the video, as the grassland touches the mirror, a whale appears in each place where the members of 'LIGHTSUM' were, and a butterfly flies around, and mysterious things happen. The video ends with all eight members gathering together and laughing at each other.
In particular, the various objects in the video and the effects expressed in CG create a mystical atmosphere, and the expectations of fans as to what meaning they contain have increased.