An Ruoxi, a Chinese girl who has never been in love, is studying abroad in South Korea alone. By chance, Ruoxi meets a boy who makes her heart beat. Her classmate Cheng Yaqi's brother - Cheng Zhixuan! As if destined, Zhixuan became Ruoxi's boyfriend thanks to Yaqi's help. Zhixuan's good friend Min Xuanhao does almost all "evils": smoking, drinking, fighting... Ruoxi has no idea why Zhixuan, who is both good in character and academics, would become friends with a bad student like Min Xuanhao, while Min Xuanhao's girlfriend Yin Feixue never seems to mind him holding hands, hugging, and kissing other girls... What is going on? Ruoxi's curiosity brought her a lot of trouble, and she and Zhixuan also had misunderstandings because of Min Xuanhao. In fact, everything was not what she saw, and Min Xuanhao was not what she thought. She didn't know that all Min Xuanhao had for Yin Feixue was a promise... Will Ruoxi and Zhixuan go on forever? What will be the ending of Min Xuanhao and Yin Feixue? Who is whose destined lover?