In the TV series "Dear Brother", Bi Hong's identity is very special, his father is the head of the Yuhua Sect, and his mother is the holy aunt of the Demon Sect. Bi Hong's parents were separated when Bi Hong was very young, and Bi Hong has been living with his father, who did not disclose Bi Hong's true identity in order to protect Bi Hong. In the Yuhua Sect, Bi Hong was trained by his father as a successor, and due to Bi Hong's youth, he was not eligible to inherit the Yuhua Sect, so Hou Chi became the current head of the Yuhua Sect. Bi Hong was not a Demon Sect, but an apprentice of the Yuhua Sect, and although Bi Hong had the blood of the Demon Sect in his body, he had no connection with the Demon Sect. When Qiu Li appeared in front of Bi Hong, Bi Hong discovered Qiu Li's true identity, and Bi Hong also learned about the affairs between his father and the Demon Sect Saint Gu later.
After Shi Xia liked Hou Chi, Bi Hong was very dissatisfied in his heart, because Bi Hong also liked Shi Xia after contacting Shi Xia, and Bi Hong felt that Shi Xia was very similar to his mother. When Bi Hong encountered danger, Shi Xia stepped forward, Shi Xia was Bi Hong's savior, Bi Hong also liked the heroine Shi Xia after this, but Shi Xia had already exchanged his heart with Hou Chi. When Bi Hong knew that Shi Xia's favorite was not himself, he had evil thoughts, and when Shi Xia had to leave Hou Chi, Bi Hong sent Shi Xia a water of forgetting love.
Bi Hong used his own thoughts and means to separate Hou Chi and Shi Xia, Shi Xia chose to drink the water of forgetting love in order not to involve Hou Chi, and Shi Xia forgot the feelings between Hou Chi and Hou Chi. After Shi Xia drank the water of forgetting love, Hou Chi had been trying to find a way to awaken Shi Xia's memory. Bi Hong wanted to replace Hou Chi's position in Shi Xia's heart after Shi Xia's amnesia, but no matter what efforts Bi Hong made, Shi Xia was never able to move Bi Hong. For the sake of his own selfish desires, Bi Hong tricked Shi Xia into drinking the water of forgetting love. Everything Bi Hong did, in the end, lifted a stone and dropped it on his own feet, not only did not make Shi Xia like himself, but also made the relationship between Shi Xia and Hou Chi more solid. Shi Xia has been guarding against Bi Hong after drinking the water of forgetting love, and Shi Xia finds that Bi Hong has ill intentions, so he is wary of Bi Hong everywhere.