Ironically Jooin's mom said she let Jooin's dad go because he was too weak but she also too weak to protect her own child from drowning. It was too sad seeing Jooin jumped into the sea to save his mom but at the end his mom abandoned him too. Jooin's parents are too selfish and don't deserve to be called parents. How could his mom was in relationship just to have fun and totally abandon her child after giving birth. At least his dad still care for Jooin until he lost sanity and abandoned Jooin alone when he was kid. I would hate my parents to the gut if i got shittiest parents like Jooin.