Su Chenbi, the descendant of the Hidden Medicine Valley, was involved in a murder case in the capital due to his special ability of "knowing life by touching blood". He was forced to solve the "heart-eating poison" for Xiao Jinyuan, the young master of the demon cultivator. However, when tracing the source of the poison, he uncovered the truth about the family's annihilation - Xiao Jinyuan was actually the bloodline of her childhood savior. The two went from using each other to secretly falling in love, but due to Xiao Jinyuan's curse of "love poison will bite back" and Su Chenbi's ability restriction of "seeing blood and bearing pain", they fell into a dead end of "the truer the love, the deeper the injury". When Xiao Jinyuan exposed her identity as a demon cultivator to protect her and was surrounded and suppressed by the righteous, Su Chenbi used blood as a guide to change her life chart, but found that all the conspiracy started from the "life-exchange contract" between the two when they were infants, and the sadomasochistic love finally became the ultimate choice of "either live together or die together." (Highlights: Superpower restrictions strengthen the tension of sadomasochism, the double shackles of "blood contact and pain" and "love poison backlash" create a strong and exciting reversal, the truth about the family's destruction and the fateful contract are nested layer by layer)
