Sheng Huainan is a name deep in Luo Zhi's heart for a very long time. He is like a ray of light to Luo Zhi who cannot help but look up and follow him. The carving on the rooftop that said "Luo Zhi loves Sheng Huainan" represents Luo Zhi's declaration of love that she could never say out loud. Luo Zhi was looking forward to starting anew only to realize that Sheng Huainan is in the same university as her. The two gradually grow close, but don't dare to express their feelings. When real-life pressures come one after another, what will become of this secret love?
Geng Geng had been an ordinary girl before her entry to the best high school in the province by chance. She doesn't like her life there until she meets Yu Huai, her seatmate - their names make up the word "Geng geng yu huai", meaning "Unforgettable memories". They don't like each other at the beginning, but soon they start to understand each other.
He Man awakes from a coma thinking that she’s still on her honeymoon with her husband Xie Yu, but she gets a rude shock: there’s a five-year gap in her memory, and during that time the couple has divorced. Confused and desperate to figure out how their marriage crumbled, He Man seeks out her ex-husband and her ex-best-friend for answers.
Chen Jianxia (played by Sun Qian), a girl who lived in a patriarchal environment since she was a child, longs to escape from the oppressive family. She is admitted to Zhenhua Middle School, where she meets the rebellious but kind-hearted boy Li Ran (played by Zhang Xincheng). Li Ran becomes the only light in her life. She is like a forgotten spaceship in the universe, and he is the only answer in the radio that has been silent for many years.
