Mc finding a box with a broken compass inside that he gave for his brother in the past then the compass starts moving and a voice message from the broken compass explains how and why his little brother has disappeared and mc deciding to use his twin little brother's identity to avenge him for the betrayals and pain that his little brother received
Spoiler from comments:
Someone said the little brother is alive
It explains how the compass and the box was returned but not the body :>
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