On the 22nd, athlete Kim Dong Hyun posted a picture that he took with Kim Jong Kook on his Instagram, with the caption, "I'm getting stronger. I am learning weight training. I have learnt a lot." In the photo, it appears that the two of them were at a gym.

Previously, on the 19th, Kim Dong Hyun had left a comment on Kim Jong Kook's YouTube channel saying, "I want to learn more about exercise, from you," which at the time raised curiosity. 

Kim Jong Kook replied, "although you said that you liked learning from me that day, why haven't you contacted me yet? Let's catch up."

In response, netizens expressed their anticipation by leaving comments such as 

- "An athlete is learning how to work out from a singer."

- "Are you guys filming for his YouTube content?"

- "I would like you two to collaborate."

- "The roles have been reversed."

- "But you are a singer."

- "Something is strange here about this situation." 

Just 5 days after opening his YouTube channel, singer Kim Jong Kook gained 1.11 million subscribers and over 7.6 million views at an overwhelmingly quick speed. After reaching 1 million subs, he took to Instagram to thank his fans.