Blue Checkerboard

Blue Checkerboard summary:

Lin Bo and Zheng Xiaotao have always been secretly attracted to each other, but because they don't know of each other's feelings, they're too embarrassed to confess. Helpless, they each turn to their own sisters. Lin Bo's little sister is a great god-like BL writer, while Zheng Xiaotao's elder sister is a great god-like BL novel reader. The two girls, priding themselves on their perfect qualifications, supply the two with a wealth of ideas. A light-hearted romantic comedy thus begins...