You're Li Chengqian of the Tang Dynasty. In the Modern Era, Call Me Big Sis

Heroine + Li Chengqian + Li Lizhi + Empress Zhangsun + Li Shimin + Little Xiangcheng A bracelet lets the spirited Gao Lin travel back and forth to the Tang dynasty, where she meets Crown Prince Li Chengqian. Want hotpot but have no girlfriends to go with? Kidnap Li Chengqian! Want to go shopping but need someone to carry your bags? Kidnap Li Chengqian! Want to play ball but have no friends around? Just go find Li Chengqian again! At their first meeting, Li Chengqian is thoroughly humiliated. He’s the dignified Crown Prince of the Tang dynasty, yet a woman takes him down in just a few moves and gives him three slaps. When they meet again, she tells him to call her Big Sis and invites him to dinner. It seems that might not be so bad. As they spend more time together, Li Chengqian accompanies his big sister from the future to eat and shop. He discovers that this sister he’s somehow acquired isn’t so bad. She takes him out for food and fun and shows him this dazzling, bizarre world! But his father isn’t happy! He worked so hard to raise a crown prince, only for a woman from the future to lead him astray. Now he wants to quit, too? “I was never going to succeed you anyway. Your Majesty, you might as well choose another crown prince!” his rebellious eldest son says, stubbornly holding his head high. This is the story of a spirited, chuuni girl who transmigrates to the golden age of Zhenguan.