At the End of the Year, the Younger Brothers Are Fighting for Each Other, so Be Obedient to Your Older Sister.

(Cheerful and heart-warming female protagonist x Baiqie Hei male protagonist, redemption + sister-brother love + secret love coming true + daily life of a wealthy family) Note: There is no blood relationship. In the early stage, when the male protagonist faces the female protagonist, he sometimes feels inferior and gloomy in his heart, with a little yandere attribute, and the female protagonist guides the lover. Chu Nuan is the goddaughter of the Gu family, and Gu Qin is the lost child of the Gu family in the early years. The Gu family found Gu Qin by a "coincidence". In order to get Chu Nuan in the early stage, Gu Qin pretended to be a little naughty dog, and asked pitifully: "Sister, have you only told me to be good, or do you do this to others?" She tricked Chu Nuan into wearing a couple's watch to attend a party: "Sister, if you don't want to wear it, is it because you don't want outsiders to know about our relationship?" Chu Nuan thought it was a sister-sister relationship, but as for Gu Qin... Inside the car, she looked at Chu Nuan with wet eyes: "Sister, will you stay with me forever?" - In the later period, Gu Qin continued to test Chu Nuan's bottom line. Once he felt safe, he stopped pretending and transformed into a super possessive wolf dog. He pressed Chu Nuan into the corner and repeatedly rubbed Chu Nuan's lips: "Sister, you said it, when you meet someone you like, you have to fight for it." In the dark bedroom, the bed hit the wall again and again, sometimes softly and sometimes heavily. He stretched out his hand and clasped his fingers with Chu Nuan: "Sister, don't call me Qin Qin, call me Guaiguai." The day she got the marriage certificate, Gu Qincai finally felt at ease, "Sister, you are mine, and we will be together forever." - Gu Qin: I can threaten anyone, but the prerequisite is that I cannot let my sister see my bad, scheming and dark side. Chu Nuan: Actually, I have known for a long time that Qin Qin is not as obedient as he appears.