!! Warning: This hanjie is a linea, it is only logical with the constraint that the picture consists of a single curved line, thus each black cell has exactly two of its four nearby cell blacks (except the two ends) !!

This is sure this is the most satisfying as aesthetics search...

You can play the first season of "Linea" to perform your skills.

Difficulty : *****

Tested, logical (as a linea).
Edge-logic can be usefull.
Good blackenage.