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A talent search event that produced a boy band in 2019 through the Mnet television channel. This is the 4th season of the Produce 101 franchise. Viewers (referred to as 'national producers') voted online for 11 members from 101 participants from various entertainment companies and individual participants in several elimination rounds. The group concept, group name and debut song are also determined by the audience.

“X1 FLASH” will follow the members as they prepare for their debut, and will also give a glimpse into their real lives and honest emotions.

No synopsis available yet.

Han Seo Ha is a bright and cheerful girl in 3rd year of middle school. She dreams of entering Hanlim Multi Art School because she loves singing. But she’s always compared to her older sister Seo Jin. Seo Jin is a sophomore in Practical Music department in Hanlim Multi Art School. She has an aura of a girl group center. She’s excellent at playing piano, but she isn’t as good as Seo Ha when it comes to singing. Cha Su Ho is a sophomore in Hanlim, his speciality is piano and vocals. He’s tall and good-looking. He has all female students attention, but he isn’t interested in any of them. Do Chae Ah is a sophomore in Hanlim. She receives attention from teachers and students because of her skills and looks. She is always unhappy with Seo Jin. Ban Da Yul is Seo Ha’s best friend, she always carries tarot cards with her and chants strange spells.