On August 6, Market News reported that MOMO and HeeChul have been in a relationship for about two years.
Shortly after the report was publicized, both MOMO and HeeChul's management agency stated that they were just close friends.

It was because they found one very suspicious video of MOMO and HeeChul from last year.
The video showed MOMO and HeeChul posing for the camera while standing next to each other.
When looked closely enough, it looked like MOMO and HeeChul were holding each other's hand at the start of the video.
Then, it looked as if they let them go after realizing that the camera was on a video mode.

They said, "They definitely are leaning way too close to one another. Look at how natural they look as well!"

(Credit= Online Community, 'kimheenim' Instagram)
(Lee Narin, SBS Star)