C268 The Approaching Dark Clouds

Su Fei and Xie Yufei remained motionless, only resorting to external breathing to quietly exchange air when they could no longer sustain their internal breaths. Once they caught their breath, they would immediately revert to internal breathing.

Peering through the gaps in the steel piping, Su Fei and Xie Yufei kept a watchful eye on Yue Seng and his group