I won't show mercy to you

Ancient wear and present double crossing ABO basically guarantees that the next day will be more irritable and arrogant (Zhuo Yu) x Cool in appearance, practical and natural, a little beauty (Tan Ting) - Zhuo Yu has never liked Tan Ting's temperament.Taimu is too cold and withdrawn, a little less human.But he admired Tan Ting's swordsmanship.So every time before each swordsmanship match, Zhuo Yu would babble once: "Although you are my junior, swordsmanship has nothing to do with age, and I will not show mercy to you." Tan Ting looked at him blankly and said yes of. - Zhuo Yu and Tan Ting crossed over.Zhuo Yu became an A and Tan Ting became an O. The two who didn't know much before had to help each other and keep each other warm in this strange new world.Although she didn't admit it, Zhuo Yu found that this stupid and stupid junior brother actually seemed... a little cute. - Later Zhuo Yu: "...You O I A, this is a matter of course, I, I, I, I will not show mercy to you this time!" The two children became high school students in the modern ABO world, From being confused and making a lot of jokes, to helping each other, to mutual affection, and finally to dating.Being attacked by a crush, I can't express it because I'm really dumb.