1. Friendship: Mei Zi and Chun Yan are friends, and friends have the obligation to help and support each other.

Empathy: Mei Zi may sympathize with Chun Yan's predicament and feel her helplessness and confusion, so she is willing to help her.

3. Sense of responsibility: Chun Yan may rely on Mei Zi in her work, and Mei Zi thinks it is her responsibility to help Chun Yan solve the problem to ensure the smooth progress of her work.

4. Professionalism: As a professional, Mei Zi may think it is her professional responsibility to help Chun Yan solve problems, which will help improve her professional image and reputation.

Generally speaking, Plum helped Chun Yan out of friendship, empathy, sense of responsibility and professionalism.