d r a m a r e b e l

that explains the engagement between Song Yuzhi and Qi Lingbo! But why are cousins born from two sisters not considered taboo? Sorry if this is a silly question, this is my first non-modern cdrama...

1) Lighter and princess
https://mydramalist.com/68429-the-lighter-and-the-princess-gown
2) My calorie boy
https://mydramalist.com/685039-my-calorie-boy
3) Remember my boy
https://mydramalist.com/38959-i-once-remembered-that-guy
4) With you
https://mydramalist.com/16987-with-you

I just came here after watching Go ahead and some of the cast are same in both of these dramas including the screenwriter, so I've decided to check this out as well!