The word "lake" is followed by a set, and there is also a house that says "library typing an idiom".

Analysis of the answer: a picture of a tower and a lake is homophonic "a mess".

idiom definition: to describe confusion or corruption to an unmanageable degree.

The origin of the idiom "Evil Sea Flower" by Qing Ceng Pu: "It's better to be old and honest, expose the truth and find your own way, instead of caring about the scene and pretending to be a hero."