The first episode was his daughter's birthday, and his mother reminded him to get a gift and spend time with her. He ended up winning, but it could've been a horrible situation if he had lost.
Sang-woo, Gi-hun's childhood friend, was also in debt. He had so much debt that he almost killed himself. Even though he was in debt, he didn't tell anyone about it except Gi-hun
Don't let greed take control of you. Sang-woo, greedy and thirsty for the prize, was very desperate to the point that he chose money over his friends/companions.
If you are struggling with your finances, you should always find someone knowledgeable about finance to help you and search for the company or person. Always do your due diligence!
Since he spent all on the claw machine, he took her to an inexpensive restaurant and ate tteokbokki (Korean stir-fried rice cakes). Set financial goals because then you'll have a purpose.