Lee Myung-gi (이명기 I Myeong-gi?), also known as Player 333, is a contestant in Squid Game in 2024.

Lee Myung-gi was once a successful YouTuber and an avid cryptocurrency trader who ran a channel called "MG Coin", where he gave out advice on cryptocurrency investing to his fans. He was also dating a woman named Kim Jun-hee, who became pregnant sometime towards the beginning of 2024.

Soon after, Myung-gi promoted a new coin called "Dalmatian" and stated that everyone should sink every last penny into it. The cryptocurrency turned out to be a scam, and when Dalmatian's creators pocketed the money and ran off, everyone who'd invested in the coin, including his girlfriend Kim Jun-hee and the rapper Thanos, lost ₩15.2 billion collectively.

Facing arrest for fraud and breaking multiple communication and investment laws, Myung-gi became a fugitive from the law. He shut down his YouTube channel and went on the run, fleeing to the Philippines, and Jun-hee broke up with him. Jun-hee attempted to keep in touch with him due to her pregnancy, but he ghosted her for six months causing her to believe he had been discreetly murdered.

Myung-gi was contacted by the Salesman in a subway station on September 1, 2024. He invited him to play a game of ddakji in exchange for money, slapping him whenever he lost. Afterwards, he gave him a contact card to enter the Squid Games, and he received a call from Jun-hee, which he ignored, unaware she had also received a contact card. With his debt totaling ₩1.8 billion, Myung-gi decided to join the games in order to win money.

During the 2024 squid game he steps forward to ask for his phone and wallet as he needs to check the crypto market, the guard proceeds to play the video of him being slapped and explain his scam and subsequent money loss. After he signs the consent form, Myung-gi is confronted by players Nam-gyu and Thanos, players who lost a lot of money due to his cryptocurrency scam, Thanos loses his temper at Myung-gi and grabs his collar, only to be talked down from attacking.