Jungkook is getting older now, but he will always be BTS’s and ARMYs’ baby. The “My Time” singer is already 22 years old but he still calls the other members as “hyungs.” As for RM, JK has a special nickname for him.

Before the BTS leader decided to go with the name “RM,” he debuted as Rap Monster in 2013. And because of that, Jungkook calls him “Rapmon hyung.“

The BTS boys have pointed out that Jungkook still calls RM “Rapmon hyung” even though the “Persona” rapper officially changed his stage name in 2017. While many may see this as a slip-up, JK actually plans to call RM that way for as long as he can.

In a scene from BTS’s Memories of 2019 DVD, J-Hope asked Jungkook if he will keep calling RM “Rapmon hyung.” The Golden Maknae replied: “He’ll be Rapmon hyung to me forever. Just give up now, I’ll always call him Rapmon hyung.”

Although RM no longer uses “Rapmon” or “Rap Monster,” the BTS leader said that he doesn’t mind if Jungkook will keep calling him that. “Do whatever you want,” he shared.

Meanwhile, RM, previously, had a difficult time finding what “RM” stands for after changing his stage name. To help him solve his dilemma, Jin, Suga, J-Hope, Jimin, V, and Jungkook pitched a few of their suggestions.

The BTS leader took to the official fan cafe site of BTS to write a lengthy blog post, explaining his decision of wanting to change his stage name. He shared that he’s marking a new direction in his artistic path with a new name and felt that “Rap Monster” belonged in his past.

Calling their leader with a different name certainly had a lot of getting used to. Jungkook accidentally called RM by his old nickname, “Rap Monnie” during one of their broadcasts in 2018. The Golden Maknae then quickly explained that RM stood for “Rap Mon” when J-Hope laughed at him for the slip.

When RM shared that the meaning of his initials still hasn’t been decided, his members started to offer some suggestions so he wouldn't be confused about it anymore. Suga said RM stands for “Rap Master.” J-Hope, however, took a different approach and focused on RM’s caring side and suggested that RM should stand for “Real Mother.”

Jungkook, then, tried to make up for his minor slip-up and suggested “Romance Master.” But then RM seemingly settled for J-Hope’s other pitch, which is “Role Model.”