First of all, they have been childhood friends since childhood, and this long-term getting along and understanding may be the basis of their feelings. The relationship between childhood friends usually cultivates deep feelings and has a deep understanding of each other's personality and hobbies, so as to better appreciate and understand each other.

Secondly, Zhu Zhixin may have some characteristics that attract Zhang Ji. For example, Zhu Zhixin is a popular idol actor, which may make Zhang Ji feel his charm. In addition, Zhu Zhixin's personality and behavior may also make Zhang Ji like it. For example, he is helpful and caring.

Finally, it may be because they have some tacit understanding or similarities, which makes Zhang Ji feel very happy and comfortable with Zhu Zhixin.

Whatever the reason, Zhang Ji's love for Zhu Zhixin is sincere, and the affection between them is also very precious.