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A romance thriller centered on four men and women, each racing toward their own desires—success, revenge, children, and love—like a runaway locomotive. Lee Sun Woo is a photographer and magazine editor who conceals a burning ambition and a desire for revenge behind his warm exterior. Han Chae Rin is the CEO of a cosmetics company, ambitious and greedy despite her achievements. Park Da Som is a rising actress willing to do anything for success, while also struggling to protect her son, who suffers from a rare disease. She faces an internal conflict between her career and motherhood, and despite her cold demeanor, she deeply loves her ill child. Hyun Seung Hoon, Park Da Som’s husband, is an aspiring model whose life goals are to overcome poverty and past failures, and to achieve success.

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