BTOB's Yook Sungjae is the next Cube Entertainment's artist to be wrapped up in a dating rumor.

On August 13th, reports claim that Yook Sungjae and DIA's Jooeun have been dating for quite a long time, in the middle of their busy schedules. One insider revealed, "The two are both busy with theis schedules but they meet each other from time to time." The source continued, "They don't really keep their relationship in secret to relatives."

Cube Entertainment has not released any statement regarding Yook Sungjae and DIA Jooeun's dating rumors.