I Transmigrated into a Black Tower in an Exile World, and I'm the Only Purification Guide

(Sentinel-and-guide setting + 1vN + competing male leads + all male leads are pure + adored by everyone + growing female lead)

Li Wei had barely transmigrated when she faced rejection by her birth parents and fiance.

She unexpectedly awakened a purification-type spirit, and learned that by absorbing enough energy, she could advance to the legendary SSS-rank guide. After arriving at the Black Tower, Li Wei dealt with various high-risk sentinels on the brink of mutation, calming them and purifying them to absorb their energy.

She was just an utterly ordinary F-rank guide. First it was Delclays, the empire's commander who had saved her. Then came the disguised star pirate Baher Lancang, Mo Lingyu, captain of the Black Tower's First Squad, the dark sentinel Ming Ye, and Fu Tingyuan, commander of the Black Tower... Why were they all coming to her?