Wise beyond her years, college student Luo Zhi reminisces about her high school crush Sheng Huainan, who's unaware of her enduring affection.
Huainan's buddy Zhang Mingrui attempts to woo Luo Zhi, who bumps into Huainan while investigating rumors of a haunted school building.
After a heart-to-heart with Huainan about courtship, Luo Zhi turns down his invitation. Mingrui confronts Xu Riqing about her feelings for Huainan.
Jake and Tiffany's mother, Zhu Yan, opens up to Luo Zhi about a painful episode from her past. Mingrui helps Huainan join Luo Zhi's case study group.
Xu Riqing observes Huainan and Luo Zhi in rehearsal and begins to understand how he truly feels. Ye Zhanyan asks Huainan to get back together with her.
Luo Zhi reflects on her childhood memories of Huainan, and while the duo's bond strengthens, Zhanyan remains unwavering in her pursuit of Huainan.
Chen Mohan uses her illness to win Ge Bi's attention. Luo Zhi asks Luo Yang whether he knows Ding Shuijing.
Zhanyan confronts Luo Zhi and reveals her troubled connection with Zhu Yan. Jiang Baili suspects Chen Mohan is lying about her illness.
Shuijing hands Huainan a voice recording that causes a misunderstanding between Luo Zhi and Huainan.
Zhanyan spins a twisted yarn in an attempt to cement Huainan's suspicions about Luo Zhi. Chen Jing confronts Shuijing.
Luo Zhi goes home to pay respect at her dad's grave. Thanks to a photo on his buddy's laptop, Huainan learns it was Luo Zhi who helped him on exam day.
At their old school, Shuijing opens up to Luo Zhi about the source of her grudge. On the bus, Huainan grabs Luo Zhi's suitcase to make her speak to him.
Mohan offers to help Ge Bi with the student council event planning. Huainan attempts to apologize to Luo Zhi.
Gu Zhiye approaches Luo Zhi at the student reception, which ends in a wreck. Ge Bi bristles at Mohan's micromanaging.
Gu Zhiye offers Baili consolation. As Shuijing watches from afar, Luo Yang surprises Chen Jing at dinner.
In a heated argument, Mingrui and Riqing confess their true feelings. Huainan follows Luo Zhi to Zhu Yan's house and helps her babysit.
Huainan solves the mystery behind Zhanyan's necklace and retrieves a long-lost item of Luo Zhi's. Ge Bi waxes nostalgic about Baili.
Luo Zhi is moved by Huainan's sentimental gestures during their date, but his mom intends to throw a wrench into their relationship.
Back in their hometown and old school, Luo Zhi and Huainan walk down memory lane. Baili spurns Ge Bi's attempt to make amends.
Huainan grapples with distressing news from home, Chen Jing discovers a photo on Luo Yang's laptop and Luo Zhi sees through Mohan's scheme.
Huainan asks Luo Zhi about a past incident involving both of their families. Luo Zhi asks Zhu Yan for a favor.
Chen Jing and Luo Yang tie the knot, Luo Zhi asks Shuijing to keep her distance, and Zhu Yan tells Huainan she will help him for Luo Zhi's sake.
As graduation looms, Mingrui reflects on their college years with Luo Zhi, meets his new flame and encounters an old friend.
Luo Zhi attends a singing competition, where an unexpected guest makes an appearance. Baili reconnects with someone from her past.