Photos disappeared from album

Hi chungdra,

Welcome to the Apple Community.

Apple support have an article online (link below) that may help:

If you're missing photos or videos in the Photos app - Apple Support

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Also:

You might want to check your iPhone has enough memory / storage space for your photos etc.

How to check the storage on your iPhone, iPad, and iPod touch - Apple Support

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And

iPhone storage and (synced) iCloud storage are not the same:

What's the difference between device storage and iCloud storage? - Apple Support

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Resources:

Eg: Find answers, or Click the "Get support" Link to the Photos Support Team:

Photos - Official Apple Support

All the best :-)