After Awakening My Fiendish Physique, My Icy Junior Sister Treats Me Like a Treasure

The Nine Nether baleful energy surged, and Su Yichen awakened a baleful body, only to become "nourishment" for his cold, beautiful junior sister. Every time she drained him, it not only cost him years of life, but also quietly increased her addiction to baleful energy. A mysterious System descended, and fragments of the truth concealed hidden clues. Lies in the pharmacy and whispered words before the altar made Su Yichen increasingly suspicious of his junior sister's identity. When the counter-drain mode unlocked and a spatial rift was torn open, what secrets lay hidden in Guixu? And what unknown past would the seal over his junior sister's heart bring to light?