Zhou Yuqing's four-year-old son is killed in a hit-and-run, and the driver flees the scene. Devastated, she vows to find the culprit and avenge her son. However, despite searching for a long time, she cannot find the perpetrator. The further blow of her husband's abandonment makes her lose all faith in life, and she attempts to take her own life. Just then, someone brings the culprit before her in pursuit of a reward. As she investigates the truth behind the accident, she is shocked to discover that those who love her have been painstakingly trying to help her let go of her emotional anguish and return to a normal life. The real culprit behind the fatal accident turns out to be none other than her best friend...