You saw everything just now, didn't you?

The sudden ringing of the doorbell in the dead of night.

It seemed unexpected, but Sam was not foolish; he quickly started to think.

No unfamiliar neighbor would ring the doorbell at such a late hour; it could only be someone he knew. And who was the only familiar person nearby?

Clearly, it was Zoe.

Only her.

Even the convenience store manager Mia, his teacher Alice, and Angel didn't yet know where he lived. 

Louis, being under strict home discipline, was unlikely to leave his house at this time, and he would have called or texted Sam in advance if he were coming.

So, this abrupt visit could only be Zoe.

But Sam didn't move; he didn't get out of bed or give in to curiosity to peek through the peephole to see who it might be.

However, the doorbell only rang briefly before quietness returned to the night, as if nothing had happened.

It all seemed like an illusion of Sam's, a dream made at some unknown time.