C2409 The Secret of Sin(part I)

Lin Hao raised his eyebrows. Research?

Could it be that the Yuwen Family was modifying or using better methods to adapt to the secret technique of Sin Region?

Lin Hao suddenly remembered the Master of the Flame Sea Sect that had died in his hands. That Master also claimed to be the secret technique of the Sin Region. However, after using the secret technique of Sin Region