He gets to experience the pain he caused by killing himself firsthand. Don't want to spoil it too much. I suggest to just view it. I understand what you mean. I cried my heart out in Nevertheless and Twentyfive twentyone for instance. But the underlying message in this all is: nothing in life is perfect. And it doesn´t need to be. I don´t like horror. And sometimes Death's game is truely horrific. But it's a fantastic story and a great watch. Though Seo In Guk even isn´t at his prettiest in this drama.