Coordinating a hit TV series with elaborate set pieces and complicated special effects can be stressful - so stressful that you might even lose your teeth. That's what happened to Korean director Hwang Dong-hyuk while he was filming Season 1 of "Squid Game" -- the stress of managing the massive production literally caused eight or nine of his teeth to fall out.

Thankfully, reading about special effects is nowhere near as draining as making them. You might be surprised to learn just how much of the show involved visual effects -- not just the high-stakes game of tug-of-war and the spectacular explosion of glass shards, but also some smaller moments outside the games and one particular stunt in the Red Light, Green Light sequence. Let's take a look behind the scenes so we can better appreciate all the work that went into "Squid Game." Otherwise poor Hwang Dong-hyuk would have lost his teeth for nothing.