Regressed to Become an S-Class Hidden Guide

"Please... pick me up! If you take me with you, I'll be useful."

Seoyul, who had been exploited his entire life at an illegal guiding trading house before meeting a miserable death.

After his regression, to change his future, he recklessly approached an esper with a proposal.

The other party was none other than Cha Dowoon, an S-class esper known for being so violent in both personality and energy that no one could guide him.

"Why should I trust you?"

"I'm a C-class guide... but my guiding has quite broad versatility..."

Having successfully caught Dowoon's interest with his talk of versatility, Seoyul is given a matching test.

The rank he had believed to be C-class his entire life suddenly changed.

"I-I'm S-class, you say?"

"Not just S-class, but hidden."

"H-hidden...?"

Seoyul wants to truly become S-class and stand alongside Dowoon.

But figuring out exactly when he transforms into S-class is not easy.

'Pong-pong-pong-'

Under what conditions does Seoyul's energy activate?