Sure, he might give you a totally blank expression on camera, or seem like he's a bit angry, but that's really, really not the case!
Still, it's been hard to convince people who don't LIVE AND BREATH VIXX of that over the years, so THANKFULLY Sunggyu was able to confirm it for us. This video doesn't have the best subtitles, but they'll do (turn on CC!) and you can see that Leo is a cute, sweet guy, even if he doesn't always show it.
To be honest, you can already see this side of him at fansigns and in more informal settings than broadcasts, but I still appreciate this kind of story coming form one of Leo's idol friends ^-^