The Male Supporting Character the System Told Me to Win Over Has Turned Dark

[Historical Romance + Alternate History + Transmigrate into a Book + Devoted to Each Other] Xi Lan transmigrates into the old-school tragic romance novel *No Escape*, where the System gives her a mission: win over Lanzhou, the gentle, well-mannered, perfect supporting male character. From the start, she's handed the role of an “innocent victim,” and Xi Lan eagerly sets out to earn his affection. Who could have guessed their first meeting would be such a scene? The legendary Young Master Lanzhou, famed for his refined elegance, has blood staining his white robes and a cold sword at her throat. His smile is gentle, yet dangerous. “Tell me, what is your relationship with Aunt Qing?” Xi Lan: ??? You call this a gentle supporting male character, System? Get me someone else! Right now! Day three of the mission: He seems... a little crazy? Get me someone else! I mean it! Day five of the mission: He is crazy, but... he seems kind of interested in me? Well... maybe he can still be saved? Day N of the mission: His affection is stuck at 10%, so Xi Lan packs her bags and prepares to run. A flash of swordlight, and that familiar chill presses against her neck. Lanzhou closes in, his lips brushing her ear, his breath burning hot. “Ah Hui, you only want to run now?” He chuckles softly, like a lover whispering sweet nothings. “Too late.” [Bonus Scene] He holds her so tightly it feels as if he wants to crush her to pieces. “Don't leave me like Mother did... I beg you, love me a little more, even if it hurts.” His father used scheming to slaughter his own family, all so he could marry someone else. Lanzhou thought he was destined to sink into darkness, until he met her. Only then did this tasteless world become colored by an obsessive longing. [Please Note] One couple, both devoted to each other, happy ending. A seemingly gentle, jade-like gentleman with a secretly obsessive, possessive streak × a transmigrator who tries to win him over and ends up trapped instead. A push-and-pull romance at the limits, with both sweetness and angst.