Implementing the Idea

The first thing Jin did after returning to his hotel room was to close the door and put all the curtains on. With that, all the preparations were completed.

Jin then opened his new phone and inputted his fingerprint into the sensor. It took a few seconds and the fingerprint was finally saved. 

Jin then locked the phone and unlocked it with the help of his fingerprint. The phone unlocked like it was supposed to.

"Let's test it out now," Jin muttered as he once again locked the phone. He used his ability to morph into one of the appearances he had saved in the system.

With his new appearance, Jin once again tried to unlock the phone.

*buzz*

The phone vibrated indicating that there was a fingerprint mismatch. A wide grin formed on Jin's face upon seeing this. His hypothesis proved to be correct. Along with his appearance, his fingerprints changed as well and he was willing to bet on the fact that it was the same with his iris.