My Cousin Is About to Turn Dark

Cheng Xi lost her mother as a child, then her father just as she came of age. With nowhere else to turn, she went to live with her maternal grandmother. The first rule of living under someone else's roof is to be charming and obedient. Cheng Xi took out a little notebook and started writing: Don't provoke Cousin. But nobody told her what to do if Cousin came over and provoked her first. Should she beat him to death? (●, ●) ◆◆◆ Pretty, sweet-talking, and playing dumb little cousin X Possessive, cunning, and wicked to the core big cousin ◆◆◆ Overprotective big cousin flirts with her online! His little cousin is adorable and sweet, and best of all, she's rich! Gu Qingyan [through gritted teeth]: Who was it that cried her eyes out as a kid, insisted on lying on top of me and hooking our fingers together, and said she would marry me when she grew up? Cheng Xi [o.O]: You must be remembering wrong. Theme: