She was a LAB RAT for 15 years. So why did she SMILE after REBIRTH?

Rosie was imprisoned for 15 years as a test subject of the Holy Temple. Everyone she loved died — her brother Julian, her only friend Jahit. But when a sacred relic sends her back in time, she wakes up 15 years in the past with one goal: rewrite history. Now she must save her brother from his tragic fate, protect her family from scheming relatives, and repay the man who sacrificed everything for her. But can a girl who lost everything truly change destiny?