An idol very well known for being extremely shy, Leo also has been seen to have very negative reactions to loud noises. It's not uncommon to see him flinching and shuddering around sudden loud sounds.
Fireworks especially seem to be Leo's life long foe
Most recently you can see Leo facing his enemy once again around the 2:08 point
Somewhat of an unusual quality to find in an idol! Especially one in such a loud group as Vixx! What do you think?