Female protagonist (You Ningxin): Formerly known as "Nightingale", a top mercenary killer. Cold-blooded and efficient, proficient in fighting, firearms, tracking, and intelligence analysis. Betrayed by his most trusted partner/top management of the organization, he died in a well-designed trap. Reborn as "You Ningxin", the only daughter of a wealthy family - the school belle of Holy Sakura Academy. She is beautiful but has a cowardly personality, mediocre academics and a low sense of presence (the original owner may also be a "transparent person" in a sense). It carries all the combat consciousness, experience and part of the "muscle memory" of the previous life (needs to be re-trained to adapt to the new body).
Male protagonist (Xiong Yi): Code-named "Zero" or "Shadow Eclipse", the ultimate "humanoid weapon" developed by an ancient mysterious organization "Youquan" at a huge cost. Possessing extraordinary reaction speed, learning ability, stealth skills and a unique set of close combat techniques. Because he was tired of the endless killings and despaired of humanity, he faked his death during a mission, used tissue technology to completely change his appearance (possibly fine-tuning it), hide his identity, and became Xiong Yi, the thin, taciturn and often bullied "invisible man" of Sacred Cherry Academy. Extremely lonely inside, longing for the ordinary but unable to escape the shadow of the past and the potential tracking of the organization.
Style: A powerful alliance in a campus setting, suspenseful revenge, two-way redemption, and full of excitement (force/IQ crushing). Mainly from the female protagonist's perspective, interspersed with first-person psychological monologues in the form of a "madman's diary" (recording clues, analysis, murderous intentions, confusion about ordinary life)
