This is a warm and cute love story between Su Xiao and Yi Xin. Su Xiao, who has been single for 19 years, has always been a male insulator. After working hard to get into university in N city, she unexpectedly met Yi Xin, the big boss who came to end her single career one night. Our Mr. Yi is really a scheming character, and he gradually gets our heroine into his arms. In fact, he just wants to give her this little rabbit a lot of love and wants to be her only letter.