Kite confirmed that Han Bing was the shadow through the stamps in Han Bing's diary.

Kite is Zheng Yaoxian, an underground intelligence agent hidden within the Kuomintang. He has always known the existence of his opponent Shadow. Because of Shadow's intervention, Zheng Yaoxian has been in danger many times and narrowly escaped death.

Shadow is an agent placed by the Kuomintang within the Communist Party. He occupies a high position and is very hidden. Everyone knows that Kite is Zheng Yaoxian’s code name when he was lurking. He and Shadow have fought several times, but He never figured out who the shadow's true identity was, so Zheng Yaoxian had to be vigilant at all times.

What is the relationship between kites and shadows:

Kites and shadows are destined to be entangled for a lifetime and cannot be separated. This classic spy drama tells the story of what is the highest state of faith, and the two ace agents-Zheng Yaoxian and Han Bing are the two people with the strongest faith in the drama.

Such a code name full of meaning corresponds to the famous saying in the play: "Couples who truly love each other may not always make it to the end, but enemies can always meet again, and they will never see each other until they look up." Due to their different beliefs, Han Bing and Zheng Yaoxian were destined to be enemies for the rest of their lives. In the end, these two people supported each other throughout their lives.

Life is so ironic sometimes, but fate is always the best scriptwriter. How can there be contradictions if there is no opposition? How can there be development if there is no conflict? "Kite" and "shadow" are actually two opposite sides of the same contradiction. They have always existed, but they have always been in a state of loving and killing each other.