This rumor came from a manipulated video of the two together. They look like being together in the image, however it turned out to be composite afterwards. So it ended up a groundless rumor.
Though this gossip was unfounded, it appears to be true that he is a fan of the girl group at least.
He said that he wants to know Red Velvet’s number when he got asked whose number he wants to get before.
He also told in another variety show that he wants to get to be close with Red Velvet. Though he didn’t mention any particular members, he showed some interest in the girl band.