I don't know which novel or movie 'Love Is A Little Blue' refers to, so I can't provide an accurate cast list. If I can provide more information, I will try my best to answer your questions.
The cast list for the Fire Blue Blade TV series included Yang Zhigang as Jiang Xiaoyu, Zheng Kai as Lu Yan, He Ziming as Zhang Chong, Liu Siyan as Black Cloud Gerel, Wang Qiang as Long Baichuan, Fan Haolun as Zhao Ziwu, Bai Wei as Xiang Yu, Liu Shuo as Ba Lang, and so on.
One possible love story could be between two main characters who come from different social strata within the 'Cast Blue Bloods' world. They might face challenges due to family expectations and the hierarchical nature of their society. For example, a commoner falling in love with a blue - blooded noble.
Well, it could be the young heir of a noble family. He might be involved in a love story, perhaps with a girl from a neighboring but less prominent family. Their love story would be filled with the drama of trying to maintain their relationship while also dealing with the politics of their families.
One memorable love story could be the one that involves a lot of sacrifice. Maybe a character sacrifices their career opportunities for the sake of their partner's well - being. This shows the depth of their love and how they prioritize each other above personal achievements.