I have some differences with the views on the first, second and third floors. Ysy should be a pinyin combination like Y sy, which is a combination of subject and predicate. ...

Y can be interpreted as: to. ..

Sy can be interpreted as: cautious, casual, casual, adaptive ... and so on.

Being together is: cautious, casual, adaptive, and so on. ...

Alternative explanation: death! This may also be what your friend said when he was angry, provided that your friend added an exclamation point after Ysy. ...

What is this? If you correspond to the tips I gave you above according to the time and related events written by friends, it should be clear.

But one thing is certain, this is definitely not graffiti, it represents a profound meaning, and it must have been written by your friend after something happened. ...