When 17-year-old Lan Jing and 16-year-old Shi Ran met, no one knew that such an innocent child would leave his heart to Shi Ran. At that time, Shi Ran just regarded Lan Jing as a small pastime in his new life, but the ignorant Lan Jing never believed in men anymore... She started to have boyfriends, but she was only in love with Shi Ran. More than two years later, due to an opportunity, Lan Jing and Shi Ran got together. From college to graduation, Lan Jing and Shi Ran lived in an orderly manner. The four years of college should be happy and sweet for them. It took Lan Jing four years to realize that the person she loved was still the 16-year-old Shi Ran in her memory. One day many years later, when Lan Jing met Shi Ran again, the 16-year-old Shi Ran appeared deep in her heart, the Shi Ran who had a cute little tiger tooth when she smiled, the Shi Ran who hugged her tightly when they kissed for the first time...