"Zhang Jiazhen is a major character in the Japanese manga series ""The Story of Hua Yan."" He plays a crucial role in the story and is introduced early on in the series.

Zhang Jiazhen is a tall and handsome man with short black hair and sharp features. He is often seen wearing a black suit that gives him a powerful and professional appearance.

Zhang Jiazhen is a successful businessman who has made a fortune in the pharmaceutical industry. He is known for his ruthless tactics and his ability to manipulate people to get what he wants. Despite his sharp demeanor, Zhang Jiazhen has a soft spot for the protagonist, Hua Yan, and he frequently helps her out when she is in trouble.

In the story, Zhang Jiazhen is initially introduced as a cold and calculating businessman who is only interested in making money. However, as the story progresses, he begins to reveal a more compassionate side of himself. He is devoted to his family and is willing to make sacrifices to protect the people he cares about.

One of the most interesting aspects of Zhang Jiazhen's character is his relationship with Hua Yan. At first, he views her as nothing more than a pawn in his schemes. However, as he gets to know her better, he begins to see her as a person and not just a means to an end. He develops a deep bond with her and becomes one of her closest allies.

Overall, Zhang Jiazhen is a complex and intriguing character who adds depth to the story. He is a well-written character who undergoes significant growth throughout the series, and readers will likely find themselves rooting for him despite his flaws."