Explaining the nature of the infinity train in a nutshell: impossible. The train is a manifestation of one’s crossroad in life. Engineered to help address a large personal issue in your life. Tulip: dealing with shame and hardship from her parents divorce. Lake: A life without purpose, because she had no defined personality, nor a name of her own. Jesse: A boy dealing with the trauma of letting his young brother get bullied relentlessly, and doing nothing when he had the power to stop it. Grace: accepting responsibility for her actions both past and present. Ryan and Min-Gi: Two best friends trying to make it in the music industry, having difficulty accepting that they need each other to go forward.