Liu Zheng (Park Hae-jin), a handsome, rich and handsome senior with excellent grades, hides an unknown side under his gentle appearance. Hong Xue (Kim Go-eun), an ordinary female college student who is the only one who can see through Liu Zheng's mind, is confusedly dating Liu Zheng. The love, contradictions and various romantic and mysterious campus stories between the two. Hong Xue, a female college student with strong opinions and good grades, doesn't know why she always feels that Liu Zheng, a popular senior in the same department, is a person who cannot be trusted, but it is because of Liu Zheng's kind help that Hong Xue can continue to stick to her studies. Although she thinks Liu Zheng is a little strange, the two eventually date in a confused way. Despite this, Liu Zheng will not easily reveal his heart after dating.